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Fixed ratio-1 responding for sensory stimuli. A. Active lever pressing during operant sessions for stimuli with different levels of variability. B. Mean of sessions 10–12 for each group in A. C. Lever accuracy for operant sessions shown in A. D. Mean lever accuracy of sessions 10–12 for each group in A. Points and bars represent mean ± SEM. N = 6–9 per group.
***p<0.001.
