Figure 3.

Antisaccade performance as a function of processing time

Data in all panels are pooled over the four monkeys.

(A) Normalized distributions (running histograms; bin size = 18°) of saccade directions in the young (top, blue) and adult (bottom, red) stages. Shades indicate the 90° spatial criterion used to classify each saccade as either directed to the target (Target, correct), to the cue (Cue, incorrect), or to neither (Inter, intermediate). Densities for young and adult, respectively, are based on 27,670 and 27,910 trials with processing times in the 0–300 range.

(B) Tachometric curves showing the proportion of correct responses at each rPT bin (bin width = 20 ms). Correct and incorrect trials were assigned using the 90° spatial criterion indicated in A. Each curve combines data from all gap conditions either in the young (blue; 16,962 correct plus incorrect trials) or adult (red; 21,606 correct plus incorrect trials) stage. Vertical lines indicate the processing times at which performance reaches 75% correct, at 140 and 155 ms. Shaded ribbons indicate standard errors based on binomial statistics.

(C) The processing time at which performance reaches 75% correct (y axis) is largely insensitive to the spatial criterion used to define correct and error trials (x axis). Highlighted data points for the young (blue) and adult (red) samples correspond to the values in B. Shaded ribbons indicate 95% confidence intervals (CIs) from bootstrap.

(D) Normalized rPT distributions for correct (light colors) and error (dark lines) responses scored with the same spatial criterion as in B. Data are from the 100 ms gap condition in the young (top, blue) and adult (bottom, red) samples. Dotted lines mark the same processing times as in B.