stimulusTimes attribute

Member of

<trial> <likert> <openended> <sliderTrial> <surveyPage>

Syntax

/ stimulusTimes = [time = stimulusname, stimulusname, ...; time = stimulusname, ...]

or

/ stimulusTimes = [time = listname]

or

/ stimulusTimes = [time = selectMode(stimulusname, stimulusname, stimulusname, ...)]

Parameters

Name	Type	Description
time	integer	A non-negative integer specifying the time in milliseconds relative to the beginning of the sequence.
selectmode	selectmodeenum	Value Description constant Constant selection of a single item. current Currently selected item of a stimulus or counter. next Next selected item of a stimulus or counter. noReplace Random selection without replacement. noReplaceCorrect Random selection without replacement if response is correct. noReplaceError Random selection without replacement if response is incorrect. noReplaceNoRepeat Random selection without replacement or repeating an item. noReplaceNot Random selection without replacement excluding the current item. not Synonym of noreplacenot. random Synonym of noreplace. replace Random selection with replacement. replaceNoRepeat Random selection with replacement and without repeating an item. replaceNot Random selection with replacement excluding the current item. sequence Sequential selection in the listed order. serial Synonym of sequence.
stimulusname	stimulus	The name of a stimulus defined elsewhere in the script to be presented on the specified frame.
listname	list	The name of a list that selects the stimulus to be presented on the specified frame.

Remarks

Given that digital monitors repaint the screen with a finite frequency (typically every 10 to 16.7 milliseconds), stimuli can only be physically presented on the display at the particular time the frame is repainted. Inquisit therefore rounds each specified time value to the nearest retrace frame boundary. For example, on a 60 hz monitor, a stimulus time of 3 would be rounded down to 0, a stimulusTime of 10 ms would be rounded up to 16.7 ms, and 36 ms would be rounded down to 33.3 ms in order to coordinate the times with the onset of the frame. Multiple stimuli can be assigned to a single time, in which case all of those stimuli are displayed simultaneouly at the given time.

Alternatively, stimulus presentation can be defined in terms of vertical retrace frames using stimulusframes.

Examples

The following trial presents a forward and backward masked prime for 10 milliseconds, and then presents a target stimulus that remains on the screen until the subject responds. Both masks are presented for 20 milliseconds.

<trial myTrial>
/stimulusTimes=[0=forwardmask; 20=prime; 30=backwardmask; 50=target]
/ validResponse=("a", "b")
/ correctResponse=("a")
</trial>

The following trial presents a forward and backward masked prime for 10 milliseconds, and then presents a target stimulus that remains on the screen until the subject responds. The particular forward and backward mask used on each trial are selected from list elements named forwardmaskselector and backwardmaskselector respectively:

<trial myTrial>
/stimulusTimes=[0=list.forwardmaskselector; 20=prime; 30=list.backwardmaskselector; 40=target]
/ validResponse=("a", "b")
/ correctResponse=("a")
</trial>

The following trial presents a focusstimulus for 500 milliseconds, then presents a two stimuli simultaneously on the left and right of the screen:

<trial myTrial>
/stimulusTimes=[0=focusstimulus; 500=lefttarget,righttarget]
/ validResponse=("a", "b")
/ correctResponse=("a")
</trial>