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. Author manuscript; available in PMC: 2009 Sep 22.
Published in final edited form as: Exp Brain Res. 2008 Jul 5;190(2):135–151. doi: 10.1007/s00221-008-1455-0

Figure 2.

Figure 2

Countermanding task. At the beginning of each trial, monkeys fixate a central spot until it disappears and a peripheral target appears. On most trials monkeys are reinforced for shifting gaze to the target. On less than half of trials at random the fixation spot reappears after a variable stop signal delay. Monkeys are reinforced for canceling the planned saccade to the peripheral target and maintaining fixation. On some trials, though, monkeys shift gaze in error; these non-canceled responses are not reinforced.