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Do we really need vision? How blind people "see" the actions of others

Ricciardi, Emiliano and Bonino, Daniela and Sani, Lorenzo and Vecchi, Tomaso and Guazzelli, Mario and Haxby, James V. and Fadiga, Luciano and Pietrini, Pietro Do we really need vision? How blind people "see" the actions of others. The Journal of Neuroscience, 29 (31). ISSN 0270-6474 (2009)

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Observing and learning actions and behaviors from others, a mechanism crucial for survival and social interaction, engages the mirror neuron system. To determine whether vision is a necessary prerequisite for the human mirror system to develop and function, we used functional magnetic resonance imaging to compare brain activity in congenitally blind individuals during the auditory presentation of hand-executed actions or environmental sounds, and the motor pantomime of manipulation tasks, with that in sighted volunteers, who additionally performed a visual action recognition task. Congenitally blind individuals activated a premotor–temporoparietal cortical network in response to aurally presented actions that overlapped both with mirror system areas found in sighted subjects in response to visually and aurally presented stimuli, and with the brain response elicited by motor pantomime of the same actions. Furthermore, the mirror system cortex showed a significantly greater response to motor familiar than to unfamiliar action sounds in both sighted and blind individuals. Thus, the mirror system in humans can develop in the absence of sight. The results in blind individuals demonstrate that the sound of an action engages the mirror system for action schemas that have not been learned through the visual modality and that this activity is not mediated by visual imagery. These findings indicate that the mirror system is based on supramodal sensory representations of actions and, furthermore, that these abstract representations allow individuals with no visual experience to interact effectively with others.

Item Type: Article
Identification Number: 10.1523/JNEUROSCI.0274-09.2009
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Research Area: Computer Science and Applications
Depositing User: Users 72 not found.
Date Deposited: 23 Dec 2015 15:17
Last Modified: 13 Sep 2016 09:55
URI: http://eprints.imtlucca.it/id/eprint/2976

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