Contributions:ANTTask

Synopsis

The main purpose of this task is to present sequential visual stimuli to the user of the BCI system. The subject will be shown an arrow on the screen pointing either to the left or to the right. On some trials, the arrow will be flanked by two arrows to the left and two arrows to the right. The subject's task is to respond to the direction of the CENTRAL arrow, press the left mouse button with the left thumb if the central arrow points to the left, or press the right mouse button with the right thumb if the central arrow points to the right.

In some trials, there will be asterisk cues indicating when or where the arrow will occur. If the cue is at the center or both above and below fixation it indicates that the arrow will appear shortly. If the cue is only above or below fixation it indicates both that the trial will occur shortly and where it will occur.

Timeline

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  Figure 1: ANT task timeline.

Parameters

EyeOpenTextDuration, EyeCloseTextDuration

Duration of introduction of eyes open/close.

TimerValueOpen, TimerValueClose

Duration of eyes open/close.

TrialDuration

Duration of one trial.

FirstFixationDurationMin, FirstFixationDurationMax

Minimum/Maximum duration of First Fixation phase.

CueDuration

Duration of cue.

MiddleFixationDuration

Duration of Middle Fixation phase.

ReactionTimeMin, ReactionTimeMax

Minimum/Maximum duration of reaction time.

CueIconList

List of cue images path.

TargetMatrix

Matrix of target images path.

BlockSequence

The sequence of the number of trials in each experiment block.

PracticeBlockSize

The number of trials in practice block.

EnableEyeOpenOrClose

Enable or disable the countdown timer at the beginning of the experiment.

CrossToCueDistance

The distance between fixation cross and cue.

CrossToTargetDistance

The distance between fixation cross and target.

CrossWidth, CrossHeight

The width/height of fixation cross.

CueWidth, CueHeight

The width/height of cue.

TargetWidth, TargetHeight

The width/height of target.

ProgressBar

Display progress bar.