Variation in rate of binocular rivalry alternation was measured in 40 undergraduate males as a function of physiological arousal induced by threat of shock and as a function of differences in verbal intelligence. Neither variable was related to changes in rate. Visual acuity and phoria were not correlated with rate. Temporal reliability of rate was on the order of .90. For all Ss rate increased significantly over trials (p < .01). Interpretations of these data are discussed.
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