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Brain, Vol. 112, No. 5, 1123-1139, 1989
© 1989 Guarantors of Brain

research-article

RESIDUAL TARGET DETECTION AS A FUNCTION OF STIMULUS SIZE

PETRA STOERIG and ALAN COWEY

Institute of Medical Psychology, Ludwig-Maximilians-University Munich, FRG Department of Experimental Psychology, Oxford University Oxford, UK

Correspondence to: Correspondence to Dr Petra Stoerig, Institut fur Medizinische Psychologie, Goethestrasse 31, D–8000 Munchen 2, FRG.

In the visual field defects of 5 patients with damage in the postgeniculate part of the primary visual system, residual detectability of an achromatic intensity target was tested as a function of target diameter, which was 10, 27, 44, 69 and 116 min of arc of visual angle. The set of 5 targets was presented at 3 different intensity ranges on a background of low photopic luminance Within this size range residual detectability was a V-shaped function of target size with a dip at 44 min of arc. This result is discussed in relation to the centre/surround organization of receptive and perceptive fields

Received December 18, 1987. Revised August 23, 1988. Accepted November 1, 1988.


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