Stimulus Uncertainty does not Affect the Time Required to Perceive Stereopsis.
VANDERBILT UNIV NASHVILLE TN DEPT OF PSYCHOLOGY
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The effect of prior knowledge on the time required to classify letters was examined for two classes of letters aLetters presented stereoscopically as random-element stereograms, and b letters presented as two dimensional physical contours. The variables of stimulus discriminability stereoscopic vs. physical contours and stimulus uncertainty were combined factorially. Stereoscopically presented letters were classified more slowly, but stimulus uncertainty had the same effect for both stereoscopic and physically defined letters. The additivity of these two variables indicates that the perception of stereoscopic forms is an automatic process not influenced by cognitive variables. Author