Template:StimulusTaskParams

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WindowBackgroundColor

The window's background color, given as an RGB value. For convenience, RGB values may be entered in hexadecimal notation, e.g. 0xff0000 for red.

PreRunDuration

The duration of the pause preceding the first sequence. Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar.

PostRunDuration

Duration of the pause following last sequence. Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar.

PreSequenceDuration

Duration of the pause preceding sequences (or sets of intensifications). Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar.

In free or copy mode, the PreSequenceDuration and PostSequenceDuration parameters may not go below twice the value of the StimulusDuration parameters, in order to allow for presentation of FocusOn and Result announcement stimuli.

PostSequenceDuration

Duration of the pause following sequences (or sets of intensifications). Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar.

When used in conjunction with the P3TemporalFilter, this value needs to be larger than the EpochLength parameter. This allows classification to complete before the next sequence of stimuli is presented.

StimulusDuration

For visual stimuli, the duration of stimulus presentation. For auditory stimuli, the maximum duration, i.e. playback of audio extending above the specified duration will be muted. Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar.

EarlyOffsetExpression

Allows the specification of an Expression that is constantly monitored during stimulus presentation. When the value of the Expression becomes non-zero, the stimulus is aborted early, before the elapsed StimulusDuration. For example, set this Expression to KeyDown==32 and start your source module with the --LogKeyboard=1 flag: then the subject can advance the stimulus sequence manually by pressing the space key.

ISIMinDuration, ISIMaxDuration

Minimum and maximum duration of the inter-stimulus interval. During the inter-stimulus interval, the screen is blank, and audio is muted.

Actual inter-stimulus intervals vary randomly between minimum and maximum value, with uniform probability for all intermediate values. Given in sample blocks, or in time units when immediately followed with 's', 'ms', or similar. Note that temporal resolution is limited to a single sample block.

InterpretMode

An enumerated value selecting on-line classification of evoked responses:

  • 0: no target is announced "attended", and no classification is performed;
  • 1: online or free mode: classification is performed, but no "attended target" is defined;
  • 2: copy mode: "attended" targets are defined, classification is performed.

DisplayResults

Switches result display of copy/free spelling on or off. In the P3Speller, setting DisplayResults to 'off' will disable execution of all speller commands (such as switching matrices) as well.