Citation

Imbiriba LA, Russo MM, de Oliveira LA, Fontana AP, Rodrigues ED, Cavalcanti Garcia MA, Vargas CD. J. Neurophysiol. 2013; 109(2): 405-414.

Affiliation

UNIVERSIDADE FEDERAL DO RIO DE JANEIRO.

Copyright

(Copyright © 2013, American Physiological Society)

DOI

10.1152/jn.00332.2011

PMID

23136345

Abstract

It is well established that the mental simulation of actions involves visual and/or somato-motor representations of those imagined actions. In order to investigate if the total absence of vision affects the brain activity associated to the retrieval of motor representations, we recorded the readiness potential (RP), a marker of motor preparation, preceding the execution as well as the motor imagery of the right middle-finger extension in the first-person (imagining oneself performing the movement, 1P) and in the third-person (imagining the experimenter performing the movement, 3P) modes in 19 sighted and 10 congenitally blind subjects. Our main result was found for the single RP slope values at the Cz channel (corresponding likely to the supplementary motor area). No difference in RP slope was found between 1P and 3P in the sighted group, suggesting that similar motor preparation networks are recruited to simulate our own and other people's actions in spite of explicit instructions to perform the task in 1P or 3P. Conversely, reduced RP slopes in 3P as compared to 1P found in the blind group indicated that they might have used an alternative, non-motor strategy to perform the task in 3P. Moreover, movement imagery ability accessed both by means of mental chronometry and of a modified version of the Movement Imagery Questionnaire (MIQ-R) indicated that blind and sighted individuals had similar motor imagery performance. Taken together, these results suggest that complete visual loss early in life modifies the brain networks that associate with other's action representations.

Language: en