Brain-damage and the spiral aftereffect: A Review

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Abstract
Data are reviewed suggesting that attentional and response factors are at the basis of the reduced susceptibility of organic Ss to the spiral aftereffect reported in many studies. In particular, organic Ss demonstrate an impaired aftereffect to the extent they are unable to maintain fixation during exposure to moving contours and are unwilling to report atypical perceptual phenomena. These variables are difficult to standardize in the clinical testing situation. Attentional and response factors merit study in their own right, and they may have greater diagnostic validity than the aftereffect measure itself.