Comparison of variable and fixed foreperiods.

<p>Mean latency (±2 SE) as a function of delay duration in <i>target</i> trials. Variable foreperiod (<i>Variable</i>) and fixed foreperiod blocks of trials (<i>Fixed</i>). In the variable foreperiod condition, mean latencies were longer for 400 ms delay duration. An opposite trend was found in the fixed foreperiod condition. Group data from 6 subjects (6/9) who participated in this control experiment.