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Spatial delayed matching task. The task starts with fixation (100 msec) and continues with spatial cue (100 msec), memory-delay interval (2750-3750 msec), and choice of target and saccade (500 msec). The memory-delay interval had three subintervals: fixation (250 msec), fix/free eye movements (2000-3000 msec), and refixation (500 msec). The behavioral requirements for the two types of trial (free and fix) are different only during the fix/free eye movements interval.
