Fig. 1: The modified color delay-estimation task.

This figure illustrates two example trials from the experiment. In the experiment, each trial begins with a fixation point presented for 300–500 ms (with a step of 50 ms). In the example array, one or three targets (squares in this example), together with zero or two distractors (circles, a 2 × 2 design), are presented on the screen for 500 ms. Subjects were instructed to remember the colors of one of the shapes in the sample array. After a 900-ms delay, the outlines of the items would appear in their original ___location, and one of the target shapes would be cued. Subjects are asked to recall and report the color of the target by clicking on the colored wheel using a computer mouse.