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PEOPLE@HES-SO – Directory and Skills inventory

PEOPLE@HES-SO
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Akselrod Michel

Akselrod Michel

Adjoint-e scientifique HES B

Main skills

Neuroscience Cognitive

Neurorehabilitation

Recherche clinique

Neuroimagerie

Gestion de projet de recherche

Modélisation statistique

Analyse des données

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Adjoint-e scientifique HES B

Desktop: AGA

HES-SO Valais-Wallis - Haute Ecole de Santé
Chemin de l'Agasse 5, 1950 Sion, CH
HEdS - VS
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2024

Body ownership alterations in stroke emerge from reduced proprioceptive precision and damage to the frontoparietal network
Scientific paper ArODES

Giulio Mastria, Tommaso Bertoni, Henri Perrin, Nikita Akulenko, Gaia Risso, Michel Akselrod, Eleonora Guanziroli, Franco Molteni, Patric Hagmann, Michela Bassolino, Andrea Serino

Med,  2024, To be published, 100536

Link to the publication

Summary:

Background: Stroke patients often experience alterations in their subjective feeling of ownership for the affected limb, which can hinder motor function and interfere with rehabilitation. In this study, we aimed at disentangling the complex relationship between sensory impairment, body ownership (BO), and motor control in stroke patients. Methods : We recruited 20 stroke patients with unilateral upper limb sensory deficits and 35 age-matched controls. Participants performed a virtual reality reaching task with a varying displacement between their real unseen hand and a visible virtual hand. We measured reaching errors and subjective ownership ratings as indicators of hand ownership. Reaching errors were modeled using a probabilistic causal inference model, in which ownership for the virtual hand is inferred from the level of congruency between visual and proprioceptive inputs and used to weigh the amount of visual adjustment to reaching movements. Findings : Stroke patients were more likely to experience ownership over an incongruent virtual hand and integrate it into their motor plans. The model explained this tendency in terms of a decreased capability of detecting visuo-proprioceptive incongruences, proportionally to the amount of proprioceptive deficit. Lesion analysis further revealed that BO alterations, not fully explained by the proprioceptive deficit, are linked to frontoparietal network damage, suggesting a disruption in higher-level multisensory integration functions. Conclusions : Collectively, our results show that BO alterations in stroke patients can be quantitatively predicted and explained in a computational framework as the result of sensory loss and higher-level multisensory integration deficits.

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