Dissociation between goal-directed and discrete response localization in a 
patient with bilateral cortical blindness

Buetti, S.; Tamietto, M.; Hervais-Adelman, Alexis; Kerzel, D.; de Gelder, B.; Pegna, A. J.

doi:10.1162/jocn_a_00404

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Dissociation between goal-directed and discrete response localization in a patient with bilateral cortical blindness

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Buetti, S., Tamietto, M., Hervais-Adelman, A., Kerzel, D., de Gelder, B., & Pegna, A. J. (2013). Dissociation between goal-directed and discrete response localization in a patient with bilateral cortical blindness. Journal of Cognitive Neuroscience, 25(10), 1769-1775. doi:10.1162/jocn_a_00404.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-DA3F-4

Abstract

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.