TY - JOUR
T1 - Dissociation between Goal-directed and Discrete Response Localization in a Patient with Bilateral Cortical Blindness
AU - Buetti, Simona
AU - Tamietto, Marco
AU - Hervais-Adelman, Alexis
AU - Kerzel, Dirk
AU - de Gelder, Beatrice
AU - Pegna, Alan J.
PY - 2013/10
Y1 - 2013/10
N2 - We investigated localization performance of simple targets in patient TN, who suffered bilateral damage of his primary visual cortex and shows complete cortical blindness. Using a two-alternative forced-choice paradigm, TN was asked to guess the position of left-right targets with goal-directed and discrete manual responses. The results indicate a clear dissociation between goal-directed and discrete responses. TN pointed toward the correct target location in approximately 75% of the trials but was at chance level with discrete responses. This indicates that the residual ability to localize an unseen stimulus depends critically on the possibility to translate a visual signal into a goal-directed motor output at least in certain forms of blindsight.
AB - We investigated localization performance of simple targets in patient TN, who suffered bilateral damage of his primary visual cortex and shows complete cortical blindness. Using a two-alternative forced-choice paradigm, TN was asked to guess the position of left-right targets with goal-directed and discrete manual responses. The results indicate a clear dissociation between goal-directed and discrete responses. TN pointed toward the correct target location in approximately 75% of the trials but was at chance level with discrete responses. This indicates that the residual ability to localize an unseen stimulus depends critically on the possibility to translate a visual signal into a goal-directed motor output at least in certain forms of blindsight.
U2 - 10.1162/jocn_a_00404
DO - 10.1162/jocn_a_00404
M3 - Article
C2 - 23944840
SN - 0898-929X
VL - 25
SP - 1769
EP - 1775
JO - Journal of Cognitive Neuroscience
JF - Journal of Cognitive Neuroscience
IS - 10
ER -