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Action-blindsight in healthy subjects after transcranial magnetic stimulation

Author:
Christensen, Mark Schram, Kristiansen, Lasse, Rowe, James B., Nielsen, Jens Bo
Source:
Proceedings of the National Academy of Sciences of the United States of America 2008 v.105 no.4 pp. 1353-1357
ISSN:
0027-8424
Subject:
cortex, human health, locomotion, people, vision
Abstract:
Clinical cases of blindsight have shown that visually guided movements can be accomplished without conscious visual perception. Here, we show that blindsight can be induced in healthy subjects by using transcranial magnetic stimulation over the visual cortex. Transcranial magnetic stimulation blocked the conscious perception of a visual stimulus, but subjects still corrected an ongoing reaching movement in response to the stimulus. The data show that correction of reaching movements does not require conscious perception of a visual target stimulus, even in healthy people. Our results support previous results suggesting that an efference copy is involved in movement correction, and this mechanism seems to be consistent even for movement correction without perception.
Agid:
2360379