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Mesure de la conscience du corps et de l'impact sur la cognition de l'information corporelle

Abstract : Although the health benefits of mindfulness are clearly established, the question of the cognitive mechanisms underlying these benefits remains poorly understood in neuroscience research. Among the potential mechanisms, the quality of body awareness is central. Body awareness results from the processing and integration of interoceptive and exteroceptive information at the cerebral level. Our first two experiments focus on the physiological evaluation of body awareness.The initial step was to study the Heartbeat Evoked Potential (HEP). This electro-neurophysiological signal, which reflects the integration of the cardiac signal at the cerebral level, has been proposed as a marker of the quality of interoception. Our first study focused on evaluating relationships between HEP amplitude, the quality of interoception and trait mindfulness. The results showed that HEP amplitude is unrelated to trait mindfulness, and does not account for the high interoceptive sensitivity associated with it.The second step focused on the physiological, postural signal. Specifically, we addressed the following question: Does the analysis of the postural signal, particularly in the closed eyes condition where body awareness plays a determinant role in postural control, help us to evaluate trait mindfulness? We demonstrated that numerical models are able to estimate trait mindfulness based on the characteristics of the postural signal. These models are most accurate when they are developed from data collected with eyes closed. These results confirm that the body awareness mechanism plays a part in mindfulness, and that posture provides information about the level of mindfulness.Furthermore, data reported in the literature show that the processing of body information impacts how the individual interacts with the environment. In the third experiment reported in this thesis, we evaluated the effect of the variation in vestibular information on the cognitive functions of inhibition and decision-making. We observed that the perturbation of vestibular information degrades the inhibition function, and that this degradation is a function of the relevance of vestibular information. Furthermore, we demonstrate that the processing of exteroceptive body information accelerates the decision-making process, due to a less conservative decision threshold, which degrades cognitive performance.Overall, our findings suggest that exteroceptive bodily information, relative to the position of the body in the environment, is a key element in body-brain interactions and shapes the adaptation of the individual to changes in the environment. Moreover, our findings highlight that posture is a useful biomarker when assessing body awareness, and could guide interventions aimed at improving mindfulness and body awareness.
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Submitted on : Monday, May 3, 2021 - 3:23:10 PM
Last modification on : Tuesday, May 4, 2021 - 3:31:59 AM


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  • HAL Id : tel-03215792, version 1



Charles Verdonk. Mesure de la conscience du corps et de l'impact sur la cognition de l'information corporelle. Psychologie et comportements. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLS036⟩. ⟨tel-03215792⟩



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