J. S. Abramowitz, B. J. Deacon, and S. P. Whiteside, Exposure therapy for anxiety: Principles and practice, 2012.

G. Acampora, D. Cook, P. Rashidi, and A. Vasilakos, A Survey on Ambient Intelligence in Healthcare, Proceedings of the IEEE, vol.101, issue.12, pp.2470-2494, 2013.
DOI : 10.1109/JPROC.2013.2262913

M. Agmon, C. K. Perry, E. Phelan, G. Demiris, and H. Nguyen, A Pilot Study of Wii Fit Exergames to Improve Balance in Older Adults, Journal of Geriatric Physical Therapy, vol.34, issue.4, pp.161-167, 2011.
DOI : 10.1519/JPT.0b013e3182191d98

M. Agogué, G. Comtet, L. Masson, P. Menudet, J. Picard et al., Managing innovative design within the health ecosystem: the living lab as an architect of the unknown, Revue Management et Avenir Santé, vol.1, issue.1, pp.17-32, 2013.

M. S. Albert, S. T. Dekosky, D. Dickson, B. Dubois, H. H. Feldman et al., The diagnosis of mild cognitive impairment due to alzheimer's disease: Recommendations from the national institute on aging-alzheimer's association workgroups on diagnostic guidelines for alzheimer's disease Alzheimer's & dementia, pp.3-270, 2011.

N. Alm, A. Astell, G. Gowans, M. Ellis, R. Dye et al., Cognitive Prostheses: Findings from Attempts to Model Some Aspects of Cognition, in Lecture Notes in Computer Science, pp.275-284, 2011.
DOI : 10.1007/978-3-642-21753-1_31

N. Alm, R. Dye, G. Gowans, J. Campbell, A. Astell et al., A Communication Support System for Older People with Dementia, Computer, vol.40, issue.5, pp.5-35, 2007.
DOI : 10.1109/MC.2007.153

F. Aman, M. Vacher, S. Rossato, and F. Portet, Speech recognition of aged voice in the AAL context: Detection of distress sentences, 2013 7th Conference on Speech Technology and Human, Computer Dialogue (SpeD), pp.1-8, 2013.
DOI : 10.1109/SpeD.2013.6682669

S. Asteriadis, K. Karpouzis, and S. Kollias, The Importance of Eye Gaze and Head Pose to Estimating Levels of Attention, 2011 Third International Conference on Games and Virtual Worlds for Serious Applications, pp.186-191, 2011.
DOI : 10.1109/VS-GAMES.2011.38

S. Asteriadis, K. Karpouzis, and S. Kollias, Visual Focus of Attention in Non-calibrated Environments using Gaze Estimation, International Journal of Computer Vision, vol.13, issue.2, pp.1-24, 2013.
DOI : 10.1007/s11263-013-0691-3

F. Badeig, P. Wargnier, M. Pino, P. De-olivera-lopes, E. Grange et al., Impact of head motion on the assistive robot expressiveness ? evaluation with elderly persons, 1st International Workshop on Affective Computing for Social Robotics (ACSR), 2016.
URL : https://hal.archives-ouvertes.fr/hal-01344312

S. K. Banala, S. K. Agrawal, and J. P. Scholz, Active Leg Exoskeleton (ALEX) for Gait Rehabilitation of Motor-Impaired Patients, 2007 IEEE 10th International Conference on Rehabilitation Robotics, pp.401-407, 2007.
DOI : 10.1109/ICORR.2007.4428456

Y. Baram and A. Miller, Virtual reality cues for improvement of gait in patients with multiple sclerosis, Neurology, vol.66, issue.2, pp.178-181, 2006.
DOI : 10.1212/01.wnl.0000194255.82542.6b

H. Bateni, Changes in balance in older adults based on use of physical therapy vs the Wii Fit gaming system: a preliminary study, Physiotherapy, vol.98, issue.3, pp.211-216, 2012.
DOI : 10.1016/j.physio.2011.02.004

W. Benkaouar and D. Vaufreydaz, Multi-sensors engagement detection with a robot companion in a home environment, Workshop on Assistance and Service robotics in a human environment at IEEE International Conference on Intelligent Robots and Systems (IROS2012), pp.45-52, 2012.
URL : https://hal.archives-ouvertes.fr/hal-00735150

S. Benveniste, Incremental Design of Therapeutic Music Games Theory and Application to the Treatment of Behavioral Disorders and Alzheimer's Disease, 2010.

K. Bergmann, F. Eyssel, and S. Kopp, A Second Chance to Make a First Impression? How Appearance and Nonverbal Behavior Affect Perceived Warmth and Competence of Virtual Agents over Time, International Conference on Intelligent Virtual Agents, pp.126-138, 2012.
DOI : 10.1007/978-3-642-33197-8_13

B. Bergvall-kåreborn, D. Howcroft, A. Ståhlbröst, and A. M. Wikman, Participation in Living Lab: Designing Systems with Users, Human Benefit Through the Diffusion of Information Systems Design Science Research, pp.317-326, 2010.
DOI : 10.1007/978-3-642-12113-5_19

B. Bergvall-kåreborn and A. Ståhlbröst, Living Lab, International Journal of Innovation and Regional Development, vol.1, issue.4, pp.356-370, 2009.
DOI : 10.4018/978-1-60960-057-0.ch016

R. P. Bhala, J. O-'donnell, E. Thoppil, and . Ptophobia, Ptophobia, Physical Therapy, vol.62, issue.2, pp.187-190, 1982.
DOI : 10.1093/ptj/62.2.187

T. Bickmore, D. Schulman, Y. , and L. , MAINTAINING ENGAGEMENT IN LONG-TERM INTERVENTIONS WITH RELATIONAL AGENTS, Applied Artificial Intelligence, vol.24, issue.6, pp.648-666, 2010.
DOI : 10.1207/s15327965pli0104_1
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3035950

T. W. Bickmore, R. A. Silliman, K. Nelson, D. M. Cheng, M. Winter et al., A Randomized Controlled Trial of an Automated Exercise Coach for Older Adults, Journal of the American Geriatrics Society, vol.66, issue.Suppl 2, pp.10-1676, 2013.
DOI : 10.1111/jgs.12449

E. B. Blanchard, J. Jones-alexander, T. C. Buckley, and C. A. Forneris, Psychometric properties of the PTSD checklist (PCL), Behaviour Research and Therapy, vol.34, issue.8, pp.669-673, 1996.
DOI : 10.1016/0005-7967(96)00033-2

F. Bloch, M. Blandin, R. Ranerison, Y. Claessens, A. Rigaud et al., Anxiety after a fall in elderly subjects and subsequent risk of developing post traumatic stress disorder at two months. A pilot study, The journal of nutrition, health & aging, vol.27, issue.3, pp.303-306, 2014.
DOI : 10.1007/s12603-013-0415-y

F. Bloch, A. Rigaud, and G. Kemoun, Virtual Reality Exposure Therapy in posttraumatic stress disorder: A brief review to open new opportunities for post-fall syndrome in elderly subjects, European Geriatric Medicine, vol.4, issue.6, pp.427-430, 2013.
DOI : 10.1016/j.eurger.2013.10.005

J. Boger, P. Poupart, J. Hoey, C. Boutilier, G. Fernie et al., A decision-theoretic approach to task assistance for persons with dementia, Proceedings of the 19th international joint conference on Artificial intelligence, pp.1293-1299, 2005.

M. W. Bondi and A. W. Kaszniak, Implicit and explicit memory in Alzheimer's disease and Parkinson's disease, Journal of Clinical and Experimental Neuropsychology, vol.14, issue.2, pp.339-358, 1991.
DOI : 10.1080/01688637908401097

B. Brandherm, H. Prendinger, and M. Ishizuka, Interest estimation based on dynamic bayesian networks for visual attentive presentation agents, Proceedings of the ninth international conference on Multimodal interfaces , ICMI '07, pp.346-349, 2007.
DOI : 10.1145/1322192.1322253

C. Bundesen and T. Habekost, Principles of visual attention: Linking mind and brain
DOI : 10.1093/acprof:oso/9780198570707.001.0001

A. Cafaro, H. H. Vilhjálmsson, T. Bickmore, D. Heylen, and C. Pelachaud, Representing Communicative Functions in SAIBA with a Unified Function Markup Language, Intelligent Virtual Agents, pp.81-94, 2014.
DOI : 10.1007/978-3-319-09767-1_11

A. J. Campbell, M. J. Borrie, and G. Spears, Risk Factors for Falls in a Community-Based Prospective Study of People 70 Years and Older, Journal of Gerontology, vol.44, issue.5, pp.112-117, 1989.
DOI : 10.1093/geronj/44.5.M112

E. Carrasco, G. Epelde, A. Moreno, A. Ortiz, I. Garcia et al., Natural interaction between avatars and persons with alzheimer's disease. In Computers Helping People with Special Needs, pp.38-45, 2008.
DOI : 10.1007/978-3-540-70540-6_5

A. ?erekovi? and I. S. Pand?i?, Multimodal behavior realization for embodied conversational agents, Multimedia Tools and Applications, vol.78, issue.1, pp.143-164, 2011.
DOI : 10.1007/s11042-010-0530-2

C. Chen, Improvement in the physiological function and standing stability based on kinect multimedia for older people, Journal of Physical Therapy Science, vol.28, issue.4, pp.4-2016
DOI : 10.1589/jpts.28.1343

J. Chen, D. Chen, X. Li, and K. Zhang, Towards Improving Social Communication Skills With Multimodal Sensory Information, IEEE Transactions on Industrial Informatics, vol.10, issue.1, pp.323-330, 2014.
DOI : 10.1109/TII.2013.2271914

K. Chen, C. , and A. , A review of technology acceptance by older adults, Gerontechnology, vol.10, issue.1, pp.1-12, 2011.
DOI : 10.4017/gt.2011.10.01.006.00

E. C. Cherry, Some Experiments on the Recognition of Speech, with One and with Two Ears, The Journal of the Acoustical Society of America, vol.25, issue.5, pp.975-979, 1953.
DOI : 10.1121/1.1907229

L. Chittaro, L. Ieronutti, R. , and S. , Supporting presentation techniques based on virtual humans in educational virtual worlds, 2005 International Conference on Cyberworlds (CW'05), p.8, 2005.
DOI : 10.1109/CW.2005.86
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.539.4980

M. C. Chung, K. J. Mckee, C. Austin, H. Barkby, H. Brown et al., Posttraumatic stress disorder in older people after a fall, International Journal of Geriatric Psychiatry, vol.67, issue.9, pp.9-955, 2009.
DOI : 10.1002/gps.2201

J. Cohen-mansfield, M. Dakheel-ali, and M. S. Marx, Engagement in persons with dementia: the concept and its measurement

A. M. Cook and J. M. Polgar, Assistive technologies: Principles and practice, 2014.

W. Coon, C. Rich, and C. L. Sidner, Activity planning for longterm relationships, Intelligent Virtual Agents, p.425, 2013.

C. Jr, P. T. Mccrae, and R. R. , Four ways five factors are basic, Personality and Individual Differences, vol.13, issue.6, pp.653-665, 1992.

M. Courgeon, Marc : modèles informatiques des émotions et de leurs expressions faciales pour l'interaction Homme-machine affective temps réel, 2011.

M. Courgeon and C. Clavel, MARC: a framework that features emotion models for facial animation during human???computer interaction, Journal on Multimodal User Interfaces, vol.4, issue.4, pp.311-319, 2013.
DOI : 10.1007/s12193-013-0124-1

M. G. Craske, K. Kircanski, M. Zelikowsky, J. Mystkowski, N. Chowdhury et al., Optimizing inhibitory learning during exposure therapy, Behaviour Research and Therapy, vol.46, issue.1, pp.5-27, 2008.
DOI : 10.1016/j.brat.2007.10.003

V. Cristancho-lacroix, J. Wrobel, I. Cantegreil-kallen, T. Dub, A. Rouquette et al., A Web-Based Psychoeducational Program for Informal Caregivers of Patients With Alzheimer???s Disease: A Pilot Randomized Controlled Trial, Journal of Medical Internet Research, vol.17, issue.5, 2015.
DOI : 10.2196/jmir.3717

F. Davis, Perceived Usefulness, Perceived Ease of Use, and User Acceptance of Information Technology, MIS Quarterly, vol.13, issue.3, pp.319-340, 1989.
DOI : 10.2307/249008

E. L. Deci, R. , and R. M. , Intrinsic motivation, 1975.

E. L. Deci, R. , and R. M. , Intrinsic Motivation and Selfdetermination in Human Behavior, 1985.

E. L. Deci, R. , and R. M. , The "What" and "Why" of Goal Pursuits: Human Needs and the Self-Determination of Behavior, Psychological Inquiry, vol.4, issue.4, pp.227-268, 2000.
DOI : 10.1037//0278-6133.17.3.269

G. Denis and P. Jouvelot, Motivation-driven educational game design, Proceedings of the 2005 ACM SIGCHI International Conference on Advances in computer entertainment technology , ACE '05, pp.462-465, 2005.
DOI : 10.1145/1178477.1178581

B. Dubois, H. H. Feldman, C. Jacova, S. T. Dekosky, P. Barberger-gateau et al., Research criteria for the diagnosis of Alzheimer's disease: revising the NINCDS???ADRDA criteria, The Lancet Neurology, vol.6, issue.8, pp.734-746, 2007.
DOI : 10.1016/S1474-4422(07)70178-3

P. Ekman and W. Friesen, The repertoire of nonverbal behavior: Categories, origins, usage, and coding, Semiotica, vol.1, issue.1, pp.49-98, 1969.

P. Ekman and W. Friesen, Unmasking the face: A guide to recognizing emotions from facial cues, 1975.

P. Ekman and W. Friesen, Manual for the facial action coding system, 1978.

P. Encrevé, D. Fornel, and M. , Le sens en pratique [construction de la référence et structure sociale de l'interaction dans le couple question, Actes de la recherche en sciences sociales, pp.1-3, 1983.

E. Commission, Growing the european silver economy, 2015.

H. J. Eysenck, The measurement of personality, 1976.
DOI : 10.1007/978-94-011-6168-8

S. Fagel, A. Hilbert, M. Mor, M. , and C. , The virtual counselor automated character animation for ambient assisted living, Proceedings of 6th International Conference on Advances in Computer-Human Interactions (ACHI'13) (2013), IARIA, pp.184-187

J. A. Falkowski, L. S. Hynan, K. Krishnan, K. Carter, L. Lacritz et al., Conversion of moca to mmse scores Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring, vol.1, pp.1-125, 2015.

C. Faur, C. Clavel, S. Pesty, M. , and J. , PERSEED: A Self-Based Model of Personality for Virtual Agents Inspired by Socio-cognitive Theories, 2013 Humaine Association Conference on Affective Computing and Intelligent Interaction, pp.467-472, 2013.
DOI : 10.1109/ACII.2013.83
URL : https://hal.archives-ouvertes.fr/hal-00947920

A. D. Fisk, W. A. Rogers, N. Charness, S. J. Czaja, and J. Sharit, Designing for Older Adults: Principles and Creative Human Factors Approaches, second ed. Human Factors & Aging Series, 2009.

M. F. Folstein, S. E. Folstein, and P. R. Mchugh, ???Mini-mental state???, Journal of Psychiatric Research, vol.12, issue.3, pp.189-198, 1975.
DOI : 10.1016/0022-3956(75)90026-6

J. Fox, K. R. Christy, and M. H. Vang, The experience of presence in persuasive virtual environments In Interacting with presence: HCI and the sense of presence in computer-mediated environments, pp.164-178, 2014.

A. Frisoli, L. Borelli, A. Montagner, S. Marcheschi, C. Procopio et al., Arm rehabilitation with a robotic exoskeleleton in Virtual Reality, 2007 IEEE 10th International Conference on Rehabilitation Robotics, pp.631-642, 2007.
DOI : 10.1109/ICORR.2007.4428491

J. A. Garcia, Y. Pisan, C. T. Tan, and K. Navarro, Assessing the Kinect???s Capabilities to Perform a Time-Based Clinical Test for Fall Risk Assessment in Older People, Entertainment Computing ? ICEC 2014: 13th International Conference Proceedings, pp.100-107, 2014.
DOI : 10.1016/j.apmr.2011.01.012
URL : https://hal.archives-ouvertes.fr/hal-01408510

M. Gaudet, B. Tavernier, F. Mourey, C. Tavernier, D. Richard et al., Le syndrome de régression psychomotrice du vieillard, Médecine et hygiène, vol.44, pp.1656-1332, 1986.

W. W. Gaver, Technology affordances, Proceedings of the SIGCHI conference on Human factors in computing systems Reaching through technology, CHI '91, pp.79-84, 1991.
DOI : 10.1145/108844.108856
URL : https://hal.archives-ouvertes.fr/hal-00692032

M. Gerardi, J. Cukor, J. Difede, A. Rizzo, R. et al., Virtual Reality Exposure Therapy for Post-Traumatic Stress Disorder and Other Anxiety Disorders, Current Psychiatry Reports, vol.19, issue.4, pp.298-305, 2010.
DOI : 10.1007/s11920-010-0128-4

M. Gerardi, J. Cukor, J. Difede, A. Rizzo, R. et al., Virtual Reality Exposure Therapy for Post-Traumatic Stress Disorder and Other Anxiety Disorders, Current Psychiatry Reports, vol.19, issue.4, pp.298-305, 2010.
DOI : 10.1007/s11920-010-0128-4

J. J. Gibson, The ecological approach to visual perception

A. Gillespie, C. Best, O. Neill, and B. , Cognitive Function and Assistive Technology for Cognition: A Systematic Review, Journal of the International Neuropsychological Society, vol.43, issue.01, pp.1-19, 2012.
DOI : 10.1093/geront/31.4.514

C. S. Green and D. Bavelier, Action video game training for cognitive enhancement, Current Opinion in Behavioral Sciences, vol.4, pp.103-108, 2015.
DOI : 10.1016/j.cobeha.2015.04.012
URL : https://archive-ouverte.unige.ch/unige:85052/ATTACHMENT01

D. Griol, J. A. Iglesias, A. Ledezma, and A. Sanchis, A dialog management methodology based on evolving Fuzzy-rule-based (FRB) classifiers, 2014 IEEE Conference on Evolving and Adaptive Intelligent Systems (EAIS), pp.1-8, 2014.
DOI : 10.1109/EAIS.2014.6867479

H. Gunes, B. Schuller, M. Pantic, C. , and R. , Emotion representation, analysis and synthesis in continuous space: A survey, Face and Gesture 2011, pp.827-834, 2011.
DOI : 10.1109/FG.2011.5771357

T. Hamada, N. Kuwahara, K. Morimoto, K. Yasuda, U. Akira et al., Universal Access in Human-Computer Interaction Addressing Diversity: 5th International Conference, UAHCI 2009, Held as Part of HCI International, Proceedings, Part I Preliminary Study on Remote Assistance for People with Dementia at Home by Using Multi-media Contents, pp.236-244, 2009.

J. Hamm, A. G. Money, A. Atwal, P. , and I. , Fall prevention intervention technologies: A conceptual framework and survey of the state of the art, Journal of Biomedical Informatics, vol.59, pp.319-345, 2016.
DOI : 10.1016/j.jbi.2015.12.013

J. Han, L. Shao, D. Xu, and J. Shotton, Enhanced computer vision with microsoft kinect sensor: A review, Cybernetics IEEE Transactions on, vol.43, issue.5, pp.1318-1334, 2013.

A. Hartholt, D. Traum, S. C. Marsella, A. Shapiro, G. Stratou et al., All Together Now, 13th International Conference on Intelligent Virtual Agents, 2013.
DOI : 10.1007/978-3-642-40415-3_33

M. Heerink, B. Kröse, V. Evers, and B. Wielinga, Assessing Acceptance of Assistive Social Agent Technology by??Older Adults: the Almere Model, International Journal of Social Robotics, vol.2, issue.2, pp.4-361, 2010.
DOI : 10.1007/s12369-010-0068-5

A. Heloir and S. Gibet, A qualitative and quantitative characterisation of style in sign language gestures In Gesture-Based Human- Computer Interaction and Simulation, 5085 in Lecture Notes in Computer Science, pp.122-133, 2009.

D. Heylen, S. Kopp, S. C. Marsella, C. Pelachaud, and H. Vilhjálmsson, The Next Step towards a Function Markup Language, Intelligent Virtual Agents, pp.270-280, 2008.
DOI : 10.1007/978-3-540-85483-8_28
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.468.5534

J. Hoey, P. Poupart, A. Von-bertoldi, T. Craig, C. Boutilier et al., Automated handwashing assistance for persons with dementia using video and a partially observable Markov decision process, Computer Vision and Image Understanding, vol.114, issue.5, pp.503-519, 2010.
DOI : 10.1016/j.cviu.2009.06.008
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.160.8351

M. K. Holden, Virtual Environments for Motor Rehabilitation: Review, CyberPsychology & Behavior, vol.8, issue.3, pp.187-211, 2005.
DOI : 10.1089/cpb.2005.8.187
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.124.1224

C. M. Huang and B. Mutlu, Robot behavior toolkit, Proceedings of the seventh annual ACM/IEEE international conference on Human-Robot Interaction, HRI '12, pp.25-32, 2012.
DOI : 10.1145/2157689.2157694

H. Huang, H. Matsushita, K. Kawagoe, Y. Sakai, Y. Nonaka et al., Toward a memory assistant companion for the individuals with mild memory impairment, 2012 IEEE 11th International Conference on Cognitive Informatics and Cognitive Computing, pp.295-299, 2012.
DOI : 10.1109/ICCI-CC.2012.6311164

D. Hymes, Foundations in sociolinguistics: An ethnographic approach, 2001.

R. Ishii, Y. I. Nakano, and T. Nishida, Gaze awareness in conversational agents, ACM Transactions on Interactive Intelligent Systems, vol.3, issue.2, pp.1-1125, 2013.
DOI : 10.1145/2499474.2499480

N. Jayasinghe, M. A. Sparks, K. Kato, K. Wyka, K. Wilbur et al., Posttraumatic stress symptoms in older adults hospitalized for fall injury, General Hospital Psychiatry, vol.36, issue.6, pp.669-673, 2014.
DOI : 10.1016/j.genhosppsych.2014.08.003
URL : http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4252653

R. Joule, F. Girandola, and F. Bernard, How Can People Be Induced to Willingly Change Their Behavior? The Path from Persuasive Communication to Binding Communication, Social and Personality Psychology Compass, vol.1, issue.1, pp.1-493, 2007.
DOI : 10.1111/j.1559-1816.1990.tb00411.x
URL : https://hal.archives-ouvertes.fr/hal-00585299

K. S. Judge, C. J. Camp, and S. Orsulic-jeras, Use of Montessori-based activities for clients with dementia in adult day care: Effects on engagement, American Journal of Alzheimer's Disease and Other Dementias, vol.15, issue.1, pp.1-42, 2000.
DOI : 10.1177/153331750001500105

M. Karg, A. Samadani, R. Gorbet, K. Kühnlenz, J. Hoey et al., Body Movements for Affective Expression: A Survey of Automatic Recognition and Generation, IEEE Transactions on Affective Computing, vol.4, issue.4
DOI : 10.1109/T-AFFC.2013.29

S. Karlin, Tactus technology. Spectrum, pp.23-23, 2013.
DOI : 10.1109/mspec.2013.6481691

S. Katz, A. B. Ford, R. W. Moskowitz, B. A. Jackson, and M. W. Jaffe, Studies of Illness in the Aged, JAMA, vol.185, issue.12, pp.12-914, 1963.
DOI : 10.1001/jama.1963.03060120024016

J. F. Kelley, An iterative design methodology for user-friendly natural language office information applications, ACM Transactions on Information Systems, vol.2, issue.1, pp.26-41, 1984.
DOI : 10.1145/357417.357420

J. W. Keogh, N. Power, L. Wooller, P. Lucas, and C. Whatman, Physical and Psychosocial Function in Residential Aged-Care Elders: Effect of Nintendo Wii Sports Games, Journal of Aging and Physical Activity, vol.22, issue.2, 2014.
DOI : 10.1123/japa.2012-0272

J. Kim, J. Son, N. Ko, and B. Yoon, Unsupervised Virtual Reality-Based Exercise Program Improves Hip Muscle Strength and Balance Control in Older Adults: A Pilot Study, Archives of Physical Medicine and Rehabilitation, vol.94, issue.5, pp.937-943, 2013.
DOI : 10.1016/j.apmr.2012.12.010

D. S. Knopman and M. J. Nissen, Implicit learning in patients with probable Alzheimer's disease, Neurology, vol.37, issue.5, pp.784-784, 1987.
DOI : 10.1212/WNL.37.5.784

S. G. Koolagudi and K. S. Rao, Emotion recognition from speech: a review, International Journal of Speech Technology, vol.9, issue.6, pp.99-117, 2012.
DOI : 10.1007/s10772-011-9125-1

S. Kopp, B. Krenn, S. Marsella, A. N. Marshall, C. Pelachaud et al., Towards a Common Framework for Multimodal Generation: The Behavior Markup Language, Intelligent Virtual Agents 4133 in Lecture Notes in Computer Science, pp.205-217, 2006.
DOI : 10.1007/11821830_17

K. Lambrecht, Information structure and sentence form: Topic, focus, and the mental representations of discourse referents, 1996.
DOI : 10.1017/CBO9780511620607

Y. Lan, R. Harvey, T. , and B. , Insights into machine lip reading, 2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), pp.4825-4828, 2012.
DOI : 10.1109/ICASSP.2012.6288999

B. Lange, S. Flynn, C. Chang, W. Liang, Y. Si et al., Development of an interactive stepping game to reduce falls in older adults, International Journal on Disability and Human Development, vol.10, issue.4, pp.4-331, 2011.
DOI : 10.1515/IJDHD.2011.056

J. Lapointe, A. Verreault, B. Bouchard, J. Bouchard, A. Potvin et al., How to Maximize the Effectiveness of Prompts in Assistive Technologies According to the Particular Cognitive Profile of People with Alzheimer???s Disease?, International Journal of Smart Home, vol.7, issue.5, pp.19-38, 2013.
DOI : 10.14257/ijsh.2013.7.5.03

K. Laver, S. George, S. Thomas, J. Deutsch, and M. Crotty, Cochrane review: virtual reality for stroke rehabilitation, European journal of physical and rehabilitation medicine, vol.48, issue.3, pp.523-530, 2012.

A. Lee and T. Kawahara, Recent development of open-source speech recognition engine julius, Proceedings: APSIPA ASC 2009: Asia-Pacific Signal and Information Processing Association Asia-Pacific Signal and Information Processing Association Annual Summit and Conference, International Organizing Committee, pp.131-137, 2009.

K. Lee, H. Hon, and R. Reddy, An overview of the sphinx speech recognition system. Acoustics, Speech and Signal Processing, IEEE Transactions on, vol.38, pp.1-35, 1990.

M. D. Leonhardt, Enhancing affective communication in embodied conversational agents through personality-based hidden conversational goals, 2012.

K. Lewin, Action Research and Minority Problems, Journal of Social Issues, vol.2, issue.4, pp.34-46, 1946.
DOI : 10.1111/j.1540-4560.1946.tb02295.x

L. Li, Q. Xu, and Y. K. Tan, Attention-based addressee selection for service and social robots to interact with multiple persons, Proceedings of the Workshop at SIGGRAPH Asia on, WASA '12, pp.131-136, 2012.
DOI : 10.1145/2425296.2425319

K. Lohse, N. Shirzad, A. Verster, N. Hodges, and H. M. Van-der-loos, Video Games and Rehabilitation, Journal of Neurologic Physical Therapy, vol.37, issue.4, pp.166-175, 2013.
DOI : 10.1097/NPT.0000000000000017

U. Lucca, M. Tettamanti, G. Logroscino, P. Tiraboschi, C. Landi et al., Prevalence of dementia in the oldest old: The Monzino 80-plus population based study, Alzheimer's & Dementia, vol.11, issue.3, pp.258-270, 2015.
DOI : 10.1016/j.jalz.2014.05.1750

M. Luppa, T. Luck, S. Weyerer, H. König, E. Brähler et al., Prediction of institutionalization in the elderly. A systematic review, Age and Ageing, vol.39, issue.1, pp.31-38, 2010.
DOI : 10.1093/ageing/afp202

N. Maiden, S. Souza, S. Jones, L. Müller, L. Pannese et al., Computing technologies for reflective, creative care of people with dementia, Communications of the ACM, vol.56, issue.11, pp.11-60, 2013.
DOI : 10.1145/2500495

V. Manera, E. Chapoulie, J. Bourgeois, R. Guerchouche, R. David et al., A Feasibility Study with Image-Based Rendered Virtual Reality in Patients with Mild Cognitive Impairment and Dementia, PLOS ONE, vol.16, issue.3, p.151487, 2016.
DOI : 10.1371/journal.pone.0151487.s001
URL : https://hal.archives-ouvertes.fr/hal-01292254

T. D. Marcotte, J. C. Scott, R. Kamat, and R. K. Heaton, Neuropsychology and the prediction of everyday functioning, Neuropsychology of everyday functioning, pp.5-38, 2010.

K. Marivan, C. Boully, S. Benveniste, S. Reingewirtz, A. Rigaud et al., Rehabilitation of the psychomotor consequences of falling in an elderly population: A pilot study to evaluate feasibility and tolerability of virtual reality training, Technology and Health Care, vol.24, issue.2, pp.1-7, 2015.
DOI : 10.3233/THC-151114

R. Marks, Physical Activity and Hip Fracture Disability: A Review, Journal of Aging Research, vol.38, issue.3, 2011.
DOI : 10.1002/14651858.CD007146.pub2
URL : http://doi.org/10.4061/2011/741918

S. Marsella and J. Gratch, Computationally modeling human emotion, Communications of the ACM, vol.57, issue.12, pp.56-67, 2014.
DOI : 10.1145/2631912

R. C. Martin, Agile software development: principles, patterns, and practices, 2003.

D. W. Maynard and D. H. Zimmerman, Topical Talk, Ritual and the Social Organization of Relationships, Social Psychology Quarterly, vol.47, issue.4, pp.301-316, 1984.
DOI : 10.2307/3033633

H. Mcgurk and J. Macdonald, Hearing lips and seeing voices, Nature, vol.65, issue.5588, pp.746-748, 1976.
DOI : 10.1038/264746a0

G. Mckhann, D. Drachman, M. Folstein, R. Katzman, D. Price et al., Clinical diagnosis of Alzheimer's disease: Report of the NINCDS-ADRDA Work Group* under the auspices of Department of Health and Human Services Task Force on Alzheimer's Disease, Neurology, vol.34, issue.7, pp.939-939, 1984.
DOI : 10.1212/WNL.34.7.939

M. Mcrorie, I. Sneddon, E. D. Sevin, E. Bevacqua, and C. Pelachaud, A Model of Personality and Emotional Traits, 5773 in Lecture Notes in Computer Science, pp.27-33, 2009.
DOI : 10.1007/978-3-642-04380-2_6

M. Mctear, Z. Callejas, and D. Griol, The Conversational Interface, 2016.
DOI : 10.1007/978-3-319-32967-3

/. Wwdocs and . User, en/ microsoft-attention-spans-research-report.pdf, 2015. [134] Mindmakers. BML 1.0 specification

B. Mishra, S. L. Fernandes, K. Abhishek, A. Alva, C. Shetty et al., Facial expression recognition using feature based techniques and model based techniques: A survey, 2015 2nd International Conference on Electronics and Communication Systems (ICECS), pp.589-594, 2015.
DOI : 10.1109/ECS.2015.7124976

D. S. Moore, E. , and R. , Measurement of fall-related psychological constructs among independent-living older adults: A review of the research literature, Aging & Mental Health, vol.42, issue.6, pp.684-699, 2008.
DOI : 10.1186/1471-2458-5-26

M. Morandell, A. Hochgatterer, S. Fagel, and S. Wassertheurer, Avatars in assistive homes for the elderly a user-friendly way of interaction? HCI and Usability for Education and Work, pp.391-402, 2008.

M. M. Morandell, A. Hochgatterer, B. Wöckl, S. Dittenberger, and S. Fagel, Avatars@home InterFACEing the smart home for elderly people, HCI and Usability for e-Inclusion 5889 in Lecture Notes in Computer Science, pp.353-365, 2009.

M. Mori, The uncanny valley, pp.33-35, 1970.

J. C. Morris, E. H. Rubin, E. J. Morris, and S. A. Mandel, Senile Dementia of the Alzheimer's Type: An Important Risk Factor for Serious Falls, Journal of Gerontology, vol.42, issue.4, pp.412-417, 1987.
DOI : 10.1093/geronj/42.4.412

F. Mourey, P. Manckoundia, I. Martin-arveux, B. Tavernier-vidal, and P. Pfitzenmeyer, Psychomotor disadaptation syndrome, Annals of Physical and Rehabilitation Medicine, vol.55, issue.5, 2004.
DOI : 10.1016/j.rehab.2012.07.673
URL : https://hal.archives-ouvertes.fr/hal-01159584

J. Murphy and B. Isaacs, The Post-Fall Syndrome, Gerontology, vol.28, issue.4, pp.265-270, 1982.
DOI : 10.1159/000212543

S. A. Muson, E. Poole, D. B. Perry, P. , and T. , Gamification and health, The Gameful World, pp.597-623, 2014.

M. Nabiyouni, A. Saktheeswaran, D. A. Bowman, and A. Karanth, Comparing the performance of natural, semi-natural, and non-natural locomotion techniques in virtual reality, 3D User Interfaces (3DUI), 2015 IEEE Symposium on, pp.3-10, 2015.

Z. S. Nasreddine, N. A. Phillips, V. Bédirian, S. Charbonneau, V. Whitehead et al., The Montreal Cognitive Assessment, MoCA: A Brief Screening Tool For Mild Cognitive Impairment, Journal of the American Geriatrics Society, vol.48, issue.4, pp.695-699, 2005.
DOI : 10.1111/j.1532-5415.2005.53221.x

Y. Nemoto, S. Egawa, A. Koseki, S. Hattori, T. Ishii et al., Power-assisted walking support system for elderly, Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol.20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No.98CH36286), pp.2693-2695, 1998.
DOI : 10.1109/IEMBS.1998.745229

D. A. Norman, The design of everyday things: Revised and expanded edition Basic books, 2013.
DOI : 10.15358/9783800648108

A. Oakley, M. F. Dawson, J. Holland, S. Arnold, C. Cryer et al., Preventing falls and subsequent injury in older people., Quality and Safety in Health Care, vol.5, issue.4, p.243, 1996.
DOI : 10.1136/qshc.5.4.243
URL : https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1055423/pdf

K. E. Olson, M. A. O-'brien, W. A. Rogers, C. , and N. , Diffusion of Technology: Frequency of use for Younger and Older Adults, Ageing International, vol.49, issue.5, pp.123-145, 2011.
DOI : 10.1007/s12126-010-9077-9

O. Reilly and K. , Ethnographic methods, 2012.

A. Ortiz, M. Del-puy-carretero, D. Oyarzun, J. J. Yanguas, C. Buiza et al., Elderly users in ambient intelligence: Does an avatar improve the interaction? In Universal Access in Ambient Intelligence Environments, 4397 in Lecture Notes in Computer Science, pp.99-114, 2007.

R. Pak and A. Mclaughlin, Designing Displays for Older Adults, 2011.
DOI : 10.1201/b10316

F. Pecune, Toward a Computational Model of Social Relations for Artificial Companions, 2013 Humaine Association Conference on Affective Computing and Intelligent Interaction, pp.677-682, 2013.
DOI : 10.1109/ACII.2013.118

T. Pejsa, S. Andrist, M. Gleicher, and B. Mutlu, Gaze and Attention Management for Embodied Conversational Agents, ACM Transactions on Interactive Intelligent Systems, vol.5, issue.1, 2015.
DOI : 10.1145/2724731

C. Pelachaud, Multimodal expressive embodied conversational agents, Proceedings of the 13th annual ACM international conference on Multimedia , MULTIMEDIA '05, pp.683-689, 2005.
DOI : 10.1145/1101149.1101301
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.716

A. Pentland, Social Signal Processing [Exploratory DSP], IEEE Signal Processing Magazine, vol.24, issue.4, pp.108-111, 2007.
DOI : 10.1109/MSP.2007.4286569

R. C. Petersen, Mild cognitive impairment as a diagnostic entity, Journal of Internal Medicine, vol.57, issue.3, pp.183-194, 2004.
DOI : 10.1037//0894-4105.13.1.121

G. Pichierri, K. Murer, and E. D. De-bruin, A cognitivemotor intervention using a dance video game to enhance foot placement accuracy and gait under dual task conditions in older adults: a randomized controlled trial, BMC geriatrics, vol.12, issue.1, 2012.

M. Pino, Human Factors and Psychosocial Challenges in the Design and Use of Assistive Technology for Older Adults with Cognitive Impairment, 2012.

M. Pino, S. Benveniste, R. Picard, and A. Rigaud, Userdriven innovation for dementia care in France: The LUSAGE living lab case study, Interdisciplinary Studies Journal, vol.3, issue.4, pp.251-268, 2014.

J. Pompeu, L. Arduini, A. Botelho, M. Fonseca, S. Pompeu et al., Feasibility, safety and outcomes of playing Kinect Adventures!??? for people with Parkinson's disease: a pilot study, Physiotherapy, vol.100, issue.2, pp.162-168, 2014.
DOI : 10.1016/j.physio.2013.10.003

M. Price, A. , and P. , The role of presence in virtual reality exposure therapy, Journal of Anxiety Disorders, vol.21, issue.5, pp.742-751, 2007.
DOI : 10.1016/j.janxdis.2006.11.002

R. Proffitt and B. Lange, User Centered Design and Development of a Game for Exercise in Older Adults, The International Journal of Technology, Knowledge, and Society: Annual Review, vol.8, issue.5, pp.95-112, 2013.
DOI : 10.18848/1832-3669/CGP/v08i05/56330

M. Rajman, Speech and language engineering, 2007.

P. Rego, P. M. Moreira, and L. P. Reis, Serious games for rehabilitation: A survey and a classification towards a taxonomy, Information Systems and Technologies (CISTI) 5th Iberian Conference on, pp.1-6, 2010.

A. A. Rendon, E. B. Lohman, D. Thorpe, E. G. Johnson, E. Medina et al., The effect of virtual reality gaming on dynamic balance in older adults, Age and Ageing, vol.41, issue.4, pp.549-552, 2012.
DOI : 10.1093/ageing/afs053

C. Rich, B. Ponsler, A. Holroyd, and C. Sidner, Recognizing engagement in human-robot interaction, 2010 5th ACM/IEEE International Conference on Human-Robot Interaction (HRI), pp.375-382, 2010.
DOI : 10.1109/HRI.2010.5453163

C. Rich, B. Ponsler, A. Holroyd, and C. L. Sidner, Recognizing engagement in human-robot interaction, 2010 5th ACM/IEEE International Conference on Human-Robot Interaction (HRI), pp.375-382, 2010.
DOI : 10.1109/HRI.2010.5453163

C. Rich and C. L. Sidner, Using Collaborative Discourse Theory to Partially Automate Dialogue Tree Authoring, Intelligent Virtual Agents, pp.327-340, 2012.
DOI : 10.1007/978-3-642-33197-8_34
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.453.8310

E. Ries, The lean startup: How today's entrepreneurs use continuous innovation to create radically successful businesses. Crown Books, 2011.

C. S. Rigby, Gamification and motivation, pp.597-623, 2014.

L. Ring, B. Barry, K. Totzke, and T. Bickmore, Addressing Loneliness and Isolation in Older Adults: Proactive Affective Agents Provide Better Support, 2013 Humaine Association Conference on Affective Computing and Intelligent Interaction, pp.61-66, 2013.
DOI : 10.1109/ACII.2013.17
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.361.8605

D. R. Roalf, P. J. Moberg, S. X. Xie, D. A. Wolk, S. T. Moelter et al., Comparative accuracies of two common screening instruments for??classification of Alzheimer's disease, mild cognitive impairment, and??healthy aging, Alzheimer's & Dementia, vol.9, issue.5, pp.529-537, 2013.
DOI : 10.1016/j.jalz.2012.10.001

M. Rousseaux, A. Sève, M. Vallet, F. Pasquier, and M. A. Mackowiak-cordoliani, An analysis of communication in conversation in patients with dementia, Neuropsychologia, vol.48, issue.13, pp.13-3884, 2010.
DOI : 10.1016/j.neuropsychologia.2010.09.026

J. A. Russell, A circumplex model of affect., Journal of Personality and Social Psychology, vol.39, issue.6, pp.1161-1178, 1980.
DOI : 10.1037/h0077714
URL : https://hal.archives-ouvertes.fr/hal-01086372

A. Salah, M. Pantic, and A. Vinciarelli, Recent developments in social signal processing, 2011 IEEE International Conference on Systems, Man, and Cybernetics, pp.380-385, 2011.
DOI : 10.1109/ICSMC.2011.6083695
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.226.2035

K. Salen and E. Zimmerman, Rules of play: Game design fundamentals, 2004.

J. A. Sanford, Universal design as a rehabilitation strategy: design for the ages, 2012.

S. Scherer, S. Marsella, G. Stratou, Y. Xu, F. Morbini et al., Perception Markup Language: Towards a Standardized Representation of Perceived Nonverbal Behaviors, Intelligent virtual agents, pp.455-463, 2012.
DOI : 10.1007/978-3-642-33197-8_47

S. Scherer, S. Marsella, G. Stratou, Y. Xu, F. Morbini et al., Perception Markup Language: Towards a Standardized Representation of Perceived Nonverbal Behaviors, Intelligent Virtual Agents 7502 in Lecture Notes in Computer Science, pp.455-463, 2012.
DOI : 10.1007/978-3-642-33197-8_47

N. Selwyn, The information aged: A qualitative study of older adults' use of information and communications technology, Journal of Aging Studies, vol.18, issue.4, pp.369-384, 2004.
DOI : 10.1016/j.jaging.2004.06.008

T. Shibata, Therapeutic Seal Robot as Biofeedback Medical Device: Qualitative and Quantitative Evaluations of Robot Therapy in Dementia Care, Proceedings of the IEEE, pp.2527-2538, 2012.
DOI : 10.1109/JPROC.2012.2200559

C. Sidner, T. Bickmore, C. Rich, B. Barry, L. Ring et al., Demonstration of an alwayson companion for isolated older adults, Proceedings of the SIGDIAL 2013 Conference, pp.148-150, 2013.

C. L. Sidner, C. Lee, C. D. Kidd, N. Lesh, R. et al., Explorations in engagement for humans and robots, Artificial Intelligence, vol.166, issue.1-2, pp.140-164, 2005.
DOI : 10.1016/j.artint.2005.03.005
URL : http://doi.org/10.1016/j.artint.2005.03.005

D. J. Simons, C. , and C. , Gorillas in our midst: Sustained inattentional blindness for dynamic events, Perception, vol.28, pp.9-1059, 1999.
DOI : 10.1068/p281059
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.321.7844

N. Skjaeret, A. Nawaz, T. Morat, D. Schoene, J. L. Helbostad et al., Exercise and rehabilitation delivered through exergames in older adults: An integrative review of technologies, safety and efficacy, International Journal of Medical Informatics, vol.85, issue.1, pp.1-16, 2016.
DOI : 10.1016/j.ijmedinf.2015.10.008

H. Sloetjes and P. Wittenburg, Annotation by category: ELAN and ISO DCR, Proceedings of the 6th International Conference on Language Resources and Evaluation (LREC), 2008.

S. T. Smith, C. Sherrington, S. Studenski, D. Schoene, and S. R. Lord, A novel Dance Dance Revolution (DDR) system for in-home training of stepping ability: basic parameters of system use by older adults, British Journal of Sports Medicine, vol.45, issue.5, pp.441-445, 2011.
DOI : 10.1136/bjsm.2009.066845

R. Stiefelhagen, M. Finke, J. Yang, and A. Waibel, From Gaze to Focus of Attention, Visual Information and Information Systems, pp.765-772, 1999.
DOI : 10.1007/3-540-48762-X_94

C. Stößel, H. Wandke, and L. Blessing, Gestural interfaces for elderly users: help or hindrance? In Gesture in embodied communication and human-computer interaction, pp.269-280, 2009.

R. Stricker, S. Hommel, C. Martin, and H. Gross, Realtime user attention and emotion estimation on a mobile robot, Proceedings of 55th Ilmenau International Scientific Colloquium, pp.13-17, 2010.

S. Studenski, S. Perera, E. Hile, V. Keller, J. Spadola-bogard et al., Interactive video dance games for healthy older adults. The journal of nutrition, health & aging, vol.14, pp.10-850, 2010.
DOI : 10.1007/s12603-010-0119-5

R. F. Tate, Correlation between a discrete and a continuous variable . point-biserial correlation. The Annals of mathematical statistics, pp.603-607, 1954.
DOI : 10.1214/aoms/1177728730

P. Taylor and A. Isard, SSML: A speech synthesis markup language, Speech Communication, vol.21, issue.1-2, pp.123-133, 1997.
DOI : 10.1016/S0167-6393(96)00068-4
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.48.7335

M. Thiebaux, S. Marsella, A. N. Marshall, and M. Kallmann, SmartBody: Behavior realization for embodied conversational agents, Proceedings of the 7th International Joint Conference on Autonomous Agents and Multiagent Systems of AAMAS '08, International Foundation for Autonomous Agents and Multiagent Systems, pp.151-158, 2008.

M. E. Tinetti, C. F. De-leon, J. T. Doucette, and D. I. Baker, Fear of Falling and Fall-Related Efficacy in Relationship to Functioning Among Community-Living Elders, Journal of Gerontology, vol.49, issue.3, pp.140-147, 1994.
DOI : 10.1093/geronj/49.3.M140

M. E. Tinetti, D. Richman, P. , and L. , Falls Efficacy as a Measure of Fear of Falling, Journal of Gerontology, vol.45, issue.6, pp.6-239, 1990.
DOI : 10.1093/geronj/45.6.P239

T. N. Tombaugh and N. J. Mcintyre, The Mini-Mental State Examination: A Comprehensive Review, Journal of the American Geriatrics Society, vol.114, issue.9, pp.922-935, 1992.
DOI : 10.1111/j.1532-5415.1992.tb01992.x

D. R. Traum and S. Larsson, The Information State Approach to Dialogue Management, Current and new directions in discourse and dialogue, pp.325-353, 2003.
DOI : 10.1007/978-94-010-0019-2_15

K. K. Tsoi, H. W. Hirai, J. Y. Chan, and T. C. Kwok, Time to Treatment Initiation in People With Alzheimer Disease: A Meta-Analysis of Randomized Controlled Trials, Journal of the American Medical Directors Association, vol.17, issue.1, pp.24-30, 2016.
DOI : 10.1016/j.jamda.2015.08.007

S. Uzor, B. , and L. , Exploring & designing tools to enhance falls rehabilitation in the home, Proceedings of the SIGCHI Conference on Human Factors in Computing Systems, CHI '13, pp.1233-1242
DOI : 10.1145/2470654.2466159

S. Uzor, B. , and L. , Investigating the long-term use of exergames in the home with elderly fallers, Proceedings of the 32nd annual ACM conference on Human factors in computing systems, CHI '14, pp.2813-2822
DOI : 10.1145/2556288.2557160

S. Uzor, L. Baillie, and D. Skelton, Senior designers, Proceedings of the 2012 ACM annual conference on Human Factors in Computing Systems, CHI '12, pp.1179-1188, 2012.
DOI : 10.1145/2207676.2208568

C. Van-doorn, A. L. Gruber-baldini, S. Zimmerman, R. Hebel, J. Port et al., Dementia as a Risk Factor for Falls and Fall Injuries Among Nursing Home Residents, Journal of the American Geriatrics Society, vol.278, issue.9, pp.9-1213, 2003.
DOI : 10.1046/j.1532-5415.2003.51404.x

H. Van-welbergen, D. Reidsma, and S. Kopp, An Incremental Multimodal Realizer for Behavior Co-Articulation and Coordination, Intelligent virtual agents, pp.175-188, 2012.
DOI : 10.1007/978-3-642-33197-8_18

H. Van-welbergen, Y. Xu, M. Thiebaux, W. Feng, J. Fu et al., Demonstrating and Testing the BML Compliance of BML Realizers, Intelligent virtual agents, pp.269-281, 2011.
DOI : 10.1007/978-3-642-23974-8_30

L. P. Vardoulakis, L. Ring, B. Barry, C. L. Sidner, and T. Bickmore, Designing Relational Agents as Long Term Social Companions for Older Adults, Intelligent Virtual Agents 7502 in Lecture Notes in Computer Science, pp.289-302, 2012.
DOI : 10.1007/978-3-642-33197-8_30
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.362.1244

V. Venkatesh, D. , and F. , A Theoretical Extension of the Technology Acceptance Model: Four Longitudinal Field Studies, Management Science, vol.46, issue.2, pp.186-204, 2000.
DOI : 10.1287/mnsc.46.2.186.11926

S. Vichitvanichphong, A. Talaei-khoei, D. Kerr, and A. H. Ghapanchi, Adoption of Assistive Technologies for Aged Care: A Realist Review of Recent Studies, 2014 47th Hawaii International Conference on System Sciences, pp.2706-2715, 2014.
DOI : 10.1109/HICSS.2014.341

H. Vilhjálmsson, N. Cantelmo, J. Cassell, N. E. Chafai, M. Kipp et al., The Behavior Markup Language: Recent Developments and Challenges, Intelligent virtual agents, pp.99-111, 2007.
DOI : 10.1007/978-3-540-74997-4_10

A. Vinciarelli, M. Pantic, and H. Bourlard, Social signal processing, Proceeding of the 16th ACM international conference on Multimedia, MM '08, pp.1743-1759, 2009.
DOI : 10.1145/1459359.1459573

A. Vinciarelli, M. Pantic, D. Heylen, C. Pelachaud, I. Poggi et al., Bridging the Gap between Social Animal and Unsocial Machine: A Survey of Social Signal Processing, IEEE Transactions on Affective Computing, vol.3, issue.1, pp.69-87, 2012.
DOI : 10.1109/T-AFFC.2011.27

R. Vipperla, M. Wolters, R. , and S. , Spoken dialogue interfaces for older people Advances in home care technologies 1, pp.118-137, 2012.

E. Vlaeyen, J. Coussement, G. Leysens, E. Van-der-elst, K. Delbaere et al., Characteristics and Effectiveness of Fall Prevention Programs in Nursing Homes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials, Journal of the American Geriatrics Society, vol.35, issue.3, pp.211-221, 2015.
DOI : 10.1111/jgs.13254

J. Wagner, F. Lingenfelser, T. Baur, I. Damian, F. Kistler et al., The social signal interpretation (SSI) framework, Proceedings of the 21st ACM international conference on Multimedia, MM '13, pp.831-834, 2013.
DOI : 10.1145/2502081.2502223

R. E. Ward, S. G. Leveille, M. K. Beauchamp, T. Travison, N. Alexander et al., Functional Performance as a Predictor of Injurious Falls in Older Adults, Journal of the American Geriatrics Society, vol.45, issue.Suppl 4, pp.315-320, 2015.
DOI : 10.1111/jgs.13203

P. Wargnier, E. Phuong, K. Marivan, S. Benveniste, F. Bloch et al., Virtual Promenade: A new serious game for the rehabilitation of older adults with Post-fall Syndrome, 2016 IEEE International Conference on Serious Games and Applications for Health (SeGAH), 2016.
DOI : 10.1109/SeGAH.2016.7586267
URL : https://hal.archives-ouvertes.fr/hal-01266471

H. Welbergen, D. Reidsma, Z. M. Ruttkay, and J. Zwiers, Elckerlyc, Journal on Multimodal User Interfaces, vol.14, issue.4, pp.271-284, 2010.
DOI : 10.1007/s12193-010-0051-3
URL : https://hal.archives-ouvertes.fr/hal-01055584

J. Wiemeyer and A. Kliem, Serious games in prevention and rehabilitation???a new panacea for elderly people?, European Review of Aging and Physical Activity, vol.33, issue.2, pp.41-50, 2012.
DOI : 10.1007/s11556-011-0093-x

F. Wilcoxon, Individual comparisons by ranking methods, Biometrics bulletin, pp.80-83, 1945.
DOI : 10.1007/978-1-4612-4380-9_16

Y. Wilks, J. M. Jasiewicz, R. Catizone, L. Galescu, K. M. Martinez et al., CALONIS: An Artificial Companion Within a Smart Home for the Care of Cognitively Impaired Patients, Smart Homes and Health Telematics, pp.255-260, 2015.
DOI : 10.1007/978-3-319-14424-5_30

B. Winblad, K. Palmer, M. Kivipelto, V. Jelic, L. Fratiglioni et al., Mild cognitive impairment - beyond controversies, towards a consensus: report of the International Working Group on Mild Cognitive Impairment, Journal of Internal Medicine, vol.256, issue.3, pp.240-246, 2004.
DOI : 10.1111/j.1365-2796.2004.01380.x

R. Winter and C. Munn-giddings, A handbook for action research in health and social care. Routledge, 2001.

Y. Wu, S. Damnée, H. Kerhervé, C. Ware, and A. Rigaud, Bridging the digital divide in older adults: a study from an initiative to inform older adults about new technologies, Clinical Interventions in Aging, vol.10, p.193, 2015.
DOI : 10.2147/CIA.S72399

R. Yaghoubzadeh, M. Kramer, K. Pitsch, and S. Kopp, Virtual Agents as Daily Assistants for Elderly or Cognitively Impaired People, pp.79-91, 2013.
DOI : 10.1007/978-3-642-40415-3_7

R. Yaghoubzadeh, K. Pitsch, and S. Kopp, Adaptive Grounding and Dialogue Management for Autonomous Conversational Assistants for Elderly Users, Intelligent Virtual Agents, pp.28-38, 2015.
DOI : 10.1007/978-3-319-21996-7_3

K. Yasuda, J. Aoe, and M. Fuketa, Development of an agent system for conversing with individuals with dementia, The 27th Annual Conference of the Japanese Society for Artificial Intelligence, 2013.

V. Young and A. Mihailidis, Difficulties in Automatic Speech Recognition of Dysarthric Speakers and Implications for Speech-Based Applications Used by the Elderly: A Literature Review, Assistive Technology, vol.14, issue.2, pp.99-112, 2010.
DOI : 10.1080/09638280110044932

W. Young, S. Ferguson, S. Brault, C. , and C. , Assessing and training standing balance in older adults: A novel approach using the ???Nintendo Wii??? Balance Board, Gait & Posture, vol.33, issue.2, pp.303-305, 2011.
DOI : 10.1016/j.gaitpost.2010.10.089
URL : https://hal.archives-ouvertes.fr/hal-00641505

M. Zajicek, A Methodology for Interface Design for Older Adults, Enterprise Information Systems Vi, pp.285-292, 2006.
DOI : 10.1007/1-4020-3675-2_34

K. K. Zakzanis, G. Quintin, S. J. Graham, and R. Mraz, Age and dementia related differences in spatial navigation within an immersive virtual environment, Medical Science Monitor, vol.15, pp.4-140, 2009.

M. Zancanaro, S. Gabrielli, A. Jameson, C. Leonardi, E. Not et al., Virtual Helper or Virtual Card Player? Contrasting Responses of Older Users, Your Virtual Butler, pp.70-78, 2013.
DOI : 10.1007/978-3-642-37346-6_7

@. J. Wrobel, M. Pino, P. Wargnier, and A. Rigaud, Robots et agents virtuels au service des personnes ??g??es??: une revue de l???actualit?? en g??rontechnologie, NPG Neurologie - Psychiatrie - G??riatrie, vol.14, issue.82, pp.2014-184
DOI : 10.1016/j.npg.2014.02.007

@. P. Wargnier, A. Malaisé, J. Jacquemot, S. Benveniste, P. Jouvelot et al., Towards attention monitoring of older adults with cognitive impairment during interaction with an embodied conversational agent, 2015 3rd IEEE VR International Workshop on Virtual and Augmented Assistive Technology (VAAT), pp.23-28, 2015.
DOI : 10.1109/VAAT.2015.7155406
URL : https://hal.archives-ouvertes.fr/hal-01137307

@. P. Wargnier, G. Carletti, Y. Laurent-corniquet, S. Benveniste, P. Jouvelot et al., Field evaluation with cognitively-impaired older adults of attention management in the Embodied Conversational Agent Louise, 2016 IEEE International Conference on Serious Games and Applications for Health (SeGAH), 2016.
DOI : 10.1109/SeGAH.2016.7586282
URL : https://hal.archives-ouvertes.fr/hal-01266477

@. P. Wargnier, E. Phuong, K. Marivan, S. Benveniste, F. Bloch et al., Virtual Promenade: A new serious game for the rehabilitation of older adults with Post-fall Syndrome, 2016 IEEE International Conference on Serious Games and Applications for Health (SeGAH), 0293.
DOI : 10.1109/SeGAH.2016.7586267
URL : https://hal.archives-ouvertes.fr/hal-01266471

A. A. Publications, @. F. Communications, P. Badeig, M. Wargnier, P. Pino et al., Impact of Head Motion on the Assistive Robot Expressiveness ? Evaluation with Elderly Persons, 1 st IEEE International Workshop on Affective Computing for Social Robotics (ACSR), 2016.

@. P. Wargnier, P. Fauquet, S. Benveniste, P. Jouvelot, A. Rigaud et al., Rehabilitation of the psychomotor consequences of elderly fallers: A pilot study to evaluate the feasibility and tolerability of virtual reality training using a user-centered designed serious game, 10 th World Conference of Gerontechnology, 2016.
URL : https://hal.archives-ouvertes.fr/hal-01410205