Fast errors in simulated antisaccade result from weak gaze-holding controls in the action-selection module.
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A. Distributions of the strength of gaze-holding control in three types of antisaccade responses: correct (black), fast errors (light grey) and slow errors (dark grey). Arrows indicate the mean of the corresponding distributions. Fast errors are significantly associated with weaker control levels. B. Spike rasters (top, thick lines denote saccade onsets) and trial averaged firing rate (bottom) from a simulated build-up neuron recorded in antisaccade trials. Trials with erroneous responses (dark grey) exhibit elevated activity prior to the stimulus onset comparing to the activity in correct antisaccade trials (black). The trend becomes more significant if we only select trials with fast errors (light grey). All activity shown here were recorded from the simulated Gap task.