On a discrete-trial successive discrimination task which contained both reinforcing and redundant stimuli, Ss displayed orderly distributions of fixations and choices of the stimuli. Practice decreased fixation frequencies of all stimuli without altering their distributions. Number of reinforcing stimuli had no effect on selectivity when stimuli differed distinctively but was related to selectivity when stimuli were ambiguous. Stimulus configuration affected selectivity, as did relative position cues. The results suggest a complex interaction between fixation and visual choice.
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