Fig. 4.

Summary of the effects of viewing time on behavior. A: log–log plot of threshold vs. viewing time from an individual session for monkey Av. Points and error bars are best-fitting values and SE, respectively, of α₁ from Eq. 1 fit to time-binned data. Line is a weighted linear fit (slope [95% CIs] = −0.65 [−0.83 −0.47]). B: log–log plot of slope vs. viewing time from the same session. Points and error bars are best-fitting values and SE, respectively, of β₁ from Eqs. 1 and 5 fit to time-binned data. Line is a weighted linear fit (slope [95% CIs] = −0.01 [−0.16 0.14]). C–F: summary of the time dependence of psychometric threshold and slope for the 4 monkeys, as indicated. Each point represents data from one session. Abscissa is the slope of the linear fit to log_e (α₁) vs. log_e (viewing time), as in A. Negative values imply threshold decreased with increasing viewing time. Ordinate is the slope of the linear fit to log_e(β₁) vs. log_e (viewing time), as in B. Negative values imply slope decreased with increasing viewing time. Arrows indicate medians.