Direction-dependent activation of the insular cortex during vertical and horizontal hand movements

Célia Rousseau 1 L. Fautrelle 2, 3 Charalambos Papaxanthis 1, * L. Fadiga 4, 5 Thierry Pozzo 1, 6, 7 Olivier White 1
* Auteur correspondant
1 CAPS - Cognition, Action, et Plasticité Sensorimotrice [Dijon - U1093]
2 CeRSM - Centre de Recherche sur le Sport et le Mouvement
3 UPN STAPS - Université Paris Nanterre - UFR Sciences et techniques des activités physiques et sportives
4 IIT Genoa
5 Human Physiology
6 IUF - Institut Universitaire de France
7 RBCS - Department of Robotics, Brain and Cognitive Sciences
Abstract : The planning of any motor action requires a complex multisensory processing by the brain. Gravity - immutable on Earth - has been shown to be a key input to these mechanisms. Seminal fMRI studies performed during visual perception of falling objects and self-motion demonstrated that humans represent the action of gravity in parts of the cortical vestibular system; in particular, the insular cortex and the cerebellum. However, little is known as to whether a specific neural network is engaged when processing non-visual signals relevant to gravity. We asked participants to perform vertical and horizontal hand movements without visual control, while lying in a 3T-MRI scanner. We highlighted brain regions activated in the processing of vertical movements, for which the effects of gravity changed during execution. Precisely, the left insula was activated in vertical movements and not in horizontal movements. Moreover, the network identified by contrasting vertical and horizontal movements overlapped with neural correlates previously associated to the processing of simulated self-motion and visual perception of the vertical direction. Interestingly, we found that the insular cortex activity is direction-dependent which suggests that this brain region processes the effects of gravity on the moving limbs through non-visual signals.
Keywords : fMRI gravitational force hand movements insular cortex internal model human vestibular cortex positron-emission-tomography manual interceptions pointing movements sensory prediction internal-models gravity-field arm movements motion
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Article dans une revue
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https://hal-univ-bourgogne.archives-ouvertes.fr/hal-01330454
Contributeur : Caps - Université de Bourgogne <>
Soumis le : vendredi 10 juin 2016 - 16:48:56
Dernière modification le : mardi 19 novembre 2019 - 09:56:07

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UNIV-BOURGOGNE | U1093 | UNIV-PARIS-LUMIERES

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Célia Rousseau, L. Fautrelle, Charalambos Papaxanthis, L. Fadiga, Thierry Pozzo, et al.. Direction-dependent activation of the insular cortex during vertical and horizontal hand movements. Neuroscience, Elsevier - International Brain Research Organization, 2016, 325, pp.10-19. ⟨10.1016/j.neuroscience.2016.03.039⟩. ⟨hal-01330454⟩

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