Effect of pooling sustained-response units. A, B, Raster plots and PSTHs of the spike data pooled by the 10 worst and best units, respectively. Same format as Figure 1. C, D, Asterisks represent the neurometric function obtained from the pooled data of the 10 worst and best units, respectively. Gray lines show the individual neurometrics of each unit. Circles represent the mean psychometric function.