Fig. 4.

Target-discrimination time and strength of the response for individual neurons. A: comparisons of the target-discrimination times between the Bright-Difficult and Dim-Easy conditions for individual neurons (n = 44). Analyses were made using neuronal data aligned at the stimulus onset (left) and saccade onset (right). Squares and circles indicate the data from monkeys Y and S, respectively. Data points located below the diagonal line indicate that the target-discrimination time was earlier in the Dim-Easy condition than in the Bright-Difficult condition. B: comparisons of the strength of the response at the target-discrimination time between the 2 stimulus conditions. Data points located below the diagonal line indicate that the strength of the response at the target-discrimination time was stronger in the Bright-Difficult condition than in the Dim-Easy condition.