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Brain, Vol. 115, No. 2, 425-444, 1992
© 1992 Oxford University Press

research-article

WAVELENGTH DISCRIMINATION IN BLINDSIGHT

PETRA STOERIG1 and ALAN COWEY2

1Institute of Medical Psychology, Ludwig-Maximilians-University Munich, Germany 2Department of Experimental Psychology, Oxford University Oxford, UK

Correspondence to: Correspondence to. Dr Petra Stoeng, Institute of Medical Psychology, Ludwig-Maximilians-University, Goethestrasse 31, 8000 Munich 2, Germany

In the circumscribed, long-standing, clinically absolute visual field defects of three patients with vascular lesions that involved the optic radiation and visual cortex, forced-choice discrumination between coloured stimuli was tested. Paired stimuli were matched for luminous efficiency on the basis of previous measurements of increment-threshold spectral sensitivity made in the same patients and at the same retinal positions To different extents all patients could discriminate between narrowband wavelength stumuli. The results imply that despite the effects of retrograde degeneration on thalamic and retinal colour-processing channels, neurons which process wavelentgth information are still functional, although the information they transmit is not consciously perceived.

Received March 27, 1991. Revised November 26, 1991. Accepted January 29, 1992.


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