Abstract
The concept of augmenting/reducing (A/R) postulates a central mechanism controlling the intensity of incoming signals and affecting the response to them. Using a kinesthetic figural aftereffect (KFA) task, Petrie (1967) classified as augmenters (Aug) subjects who judged a standard stimulus as larger after kinesthetic stimulation, and reducers (Red) as showing the opposite tendency. The stimulus intensity control mechanism could also be inferred from amplitude changes in evoked potential (EP) components elicited by stimuli of different intensities. The amplitude/intensity slope function of the vertex visual evoked potential (VEP) PIN, component became a standard measure of A/R (Buchsbaum et al. 1983). Although correlations between KFA scores and VEP slope have been reported, the crossmodal stability of A/R has been questioned (Kaskey et al. 1980; Raine et al. 1981). Absence of auditory reducing at the vertex and no correlations between visual and auditory P,N, or
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