Figure 4

Delay duration and visual dimensions interactively modulated monkeys' response. time. (a) Mean normalised response time is shown for each delay duration in both matching dimensions. The increase in response time due to a longer delay duration was dependent on the matching dimension. (b) The magnitude of delay cost (normalised response time difference between the 1500 ms and 4500 ms delay period) is shown in both matching dimensions. The delay cost was higher in the colour dimension than in the preferred shape dimension.