CENTROID ANALYSIS PREDICTS VISUAL LOCALIZATION OF FIRST-ORDER AND 2ND-ORDER STIMULI

Perceived alignment of asymmetric Gaussian-windowed stimuli was measur ed in an attempt to differentiate,between stimulus characteristics whi ch might underlie visual localization. These asymmetric stimuli have t he advantage of being continuous in the spatial domain and of possessi ng well-defined spatial characteristics in which centroid, points of i nflexion and peak can be separated from each other. Results for both l uminance- and contrast-defined stimuli are reasonably well described o n the basis that the centroid of the stimulus envelope represents the primitive which determines perceived visual location. Centroid locatio n is inherent in the output of filters which are large enough to cover the object of interest. Copyright (C) 1996 Elsevier Science Ltd.