[Effects of subjective contours in stroboscopic motion (author's transl)].

It was tested whether "subjective" contours have functional effects similar to real contours on stroboscopic motion. The probability of seeing motion between a pair of subjective contour stimuli was compared with that between a pair of the corresponding real contour stimuli. The results were as follows: (1) For both identical shapes and disparate shapes, subjective contours had functional effects similar to real contours, but this equivalence was not enhanced increasing duration. (2) Three types of stroboscopic motion were observed when between two disparate shapes was used as stimuli (two-dimensional rotation of rigid shapes, rotation in depth and plastic deformation), dependent on geometrical transformations between stimulus pairs rather than on ISI and duration.