Number Presented

FIGURE 6.2 (a) The probability of signaling response completion as a function of the number of responses the rat made and the number that was required to obtain reward. Data from Platt and Johnson (1971). (b) The mean number of responses made (left axis, circles) and the standard deviation (right axis, squares) of the response distributions shown in panel (a), and the coefficient of variation (CV), which is the ratio of the standard deviation to the mean, as a function of the number required. (c) The mean (left axis, circles), standard deviation (right axis, squares), and CV (lower panel) as a function of the number of button responses required obtained by Whalen et al. (1999). The constant CV shown for rats in panel (b) and humans in panel (c) demonstrates that both species represent number with scalar variability.

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