Residual target detection as a function of stimulus size.
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.
Stoerig
P
P
Institute of Medical Psychology, Ludwig-Maximilians-University, Munich, FRG.
Cowey
A
A
D000328:Adult; D000368:Aged; D003116:Color; D006801:Humans; D008027:Light; D008875:Middle Aged; D010775:Photic Stimulation / Q000379:methods; D012372:ROC Curve; D012684:Sensory Thresholds; D014786:Vision Disorders / Q000503:physiopathology*; D014794:Visual Fields