Contributions:ANTTask

Synopsis

The main purpose of the Attention Network Test (ANT) task is to test the alerting, orienting, and executive control networks in children and adults. It is based on the ANT task designed by J. Fan (Fan, J., McCandliss, B. D., Sommer, T., Raz, A., & Posner, M. I. (2002). Testing the efficiency and independence of attentional networks. Journal of Cognitive Neuroscience, 14(3), 340-7.) This task presents sequential visual stimuli to the user of the BCI2000 system. The subject will be shown an arrow on the screen pointing either to the left or to the right. In 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. The subject should hold the mouse in both hands and 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: Single trial timeline.

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  Figure 2: State value in different target condition

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  Figure 3: Cue value in different cue condition

Versioning

Authors

Huiling Huang (huiling@neurotechcenter.org)

Version History

• 2022-05-04: Initial public release by Huiling Huang (huiling@neurotechcenter.org)

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 in relative coordinates (between 0 and 1).

CrossToTargetDistance

The distance between fixation cross and target in relative coordinates (between 0 and 1).

CrossWidth, CrossHeight

The width/height of fixation cross in relative coordinates (between 0 and 1).

CueWidth, CueHeight

The width/height of cue in relative coordinates (between 0 and 1).

TargetWidth, TargetHeight

The width/height of target in relative coordinates (between 0 and 1).

ProgressBar

Display progress bar.

ProgressBarHeight, ProgressBarWidth

Progress bar height/width in pixels.

ProgressBarBackgroundColor, ProgressBarForegroundColor

Color of progress bar background/foreground.

PhotoDiodePatch

Display a photo diode patch on the stimulus window. Recording from a photo diode located on that patch will allow triggering on actual stimulus delivery (see User_Reference:P3TemporalFilter#OnsetExpression).

PhotoDiodePatchHeight, PhotoDiodePatchWidth

Photo diode patch height/width in relative coordinates (between 0 and 1).

PhotoDiodePatchLeft, PhotoDiodePatchTop

Photo diode patch left/top position in relative coordinates (between 0 and 1).

PhotoDiodePatchShape

Photo diode patch shape: 0 rectangle, 1 ellipse.

PhotoDiodePatchActiveColor

Photo diode patch color when active (RGB color in format 0xrrggbb).

PhotoDiodePatchInactiveColor

Photo diode patch color when inactive, (RGB color in format 0xrrggbb, use 0xff000000 for transparent).

States

PhaseNumber

The index of phase in each trial. (8 bits) 1: Pre Cue; 2: Cue; 3: Pre Stimulus; 4: Stimulus; 5: Post Stimulus.

TrialNumber

Index of trials. (16 bits)

FirstFixationDuration

List of the duration of first fixation phase in each trial. (microsecond, 32 bits)

ReactionTime

List of reaction time in each trial.(microsecond, 32 bit)

LastFixationDuration

List of the duration of last fixation phase in each trial. (microsecond, 32 bits)

BlockNum

Index of experiment block.

TargetDirection

1: pointing left; 2: pointing right.

FlankerDirection

1: pointing left; 2: pointing right.

TargetLocation

1: low; 2: high.

CueLocation

1: low; 2: high; 3: middle; 4 = there was/is/will be no cue on this trial.

CueVisible

0: cue is not visible right now; 1 = cue is visible right now.

TargetVisible

0: target is not visible right now; 1: target is visible right now.

See also

Contributions:Applications