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A subject (D.B.) who had no experience of visual stimuli in a field defect caused by visual cortex damage but could discriminate them ('blindsight') nevertheless reported visible after-images of the stimuli when they were turned off ('prime-sight'). This was investigated using projected visual stimuli of varying colors, contrasts, shapes and spatial frequencies, and by measuring the properties of the after-images, including their duration, size scaling, color and interocular transfer, comparing the capacity of the blindsight and prime-sight modes. These phenomena offer a unique opportunity to compare conscious and unconscious neural events in response to the same visual events.

Original publication




Journal article


Nat Neurosci

Publication Date





101 - 102


Adult, Afterimage, Blindness, Cortical, Humans, Photic Stimulation, Postoperative Period, Visual Cortex