Figure 1.

Correlations in RT and SOA task. A, Scatter plot of RRT against SRT for a simple look–reach task. Each dot shows the RTs for one trial. B, Each trial starts with the subject fixating and touching a central target. The appearance of the peripheral target (yellow) and simultaneous disappearance of the central fixation target (red) cues the subject to make a saccade to the peripheral stimulus. After a random interval, an auditory cue instructs the subject to make a reach movement to the peripheral target. C, Distribution of SOA durations. In 70% of reach-and-saccade trials, the SOA was 0, whereas in the remaining 30% of reach-and-saccade trials, SOA was a random duration drawn from a uniform distribution between 0 and 620 ms. To prevent the subject from anticipating reaches, in 20% of the total number of trials, subjects had to respond to the saccade cue only and keep touching the central target (delayed saccade and touch trials).