FIG. 4.

Identification of the different time courses of CS responses across all 39 directional neurons as revealed by their MI curves. A: distributions of responses according to the width and peak amplitude time of the MI curve. On the scatter plot, the vertical and horizontal lines were chosen to delimit the parts of each histogram with the highest number of counts. The shaded rectangle delimited by these lines identifies responses that all have short latencies with little variation. These early-compact neurons are identified here and in subsequent figures by open squares. Responses that fall outside the shaded rectangle tend to have both longer latencies and more variability. Such late-broad units are identified here and in subsequent figures by filled squares. B: smoothed MI curves for the 25 early-compact units. Significance thresholds (arrows) for these data ranged from 0.020 to 0.033 bits. C: smoothed MI curves for 14 late-broad units. Significance thresholds for these data ranged from 0.018 to 0.034 bits. D: smoothed MI curves for 9 units that did not show a correlation between CS occurrence and error direction. Significance thresholds for these data ranged from 0.021 to 0.031 bits.