Contour Interaction in Visual Space.
Final rept. 20 Sep 76-30 Apr 81,
VANDERBILT UNIV NASHVILLE TN DEPT OF PSYCHOLOGY
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The goal of this project was to determine if interactions among visual stimuli known to occur in 2-dimensional space are substantially altered when interacting elements are placed in 3 dimensions. Interaction, or interference, refers to changes in the perceptibility or appearance of stimuli that occur when placed in close spatial proximity to other stimuli. While these interactions, which are known to influence the processing of information in visual displays, have been studied extensively in the 2-dimensional case, the extension to 3 dimensions has been limited by technical problems associated with manipulation of stimuli simultaneously in X, Y, and Z axes. The project overcame these limitations by using, as interacting stimuli, stereoscopic forms generated from random element stereograms. The interactive phenomena investigated were destructive interactions threshold elevation under transient threshold level conditions destructive interactions under suprathreshold conditions distortive interactions changes in apparent length under suprathreshold conditions and interactions imposed by the geometry of 3-dimensional space. Major findings include 1 Separating the interacting stimuli in depth substantially modified their interaction and 2 The vertical dimension of stereoscopic visual space is tilted away from the observer.
- Anatomy and Physiology