trials attribute

Member of

<block>

Syntax

/ trials = [trialnumber, trialnumber = trialname; trialnumber-trialnumber = selectMode(trialname, trialname,...); trialnumber, trialnumber-trialnumber = trialname]

or

/ trials = [trialnumber-trialnumber = listname]

Parameters

Name	Type	Description
trialnumber	integer	A non-negative integer specifying the trial number.
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.
trialname	trial	The name of a trial defined elsewhere in the script to be run on this block.
listname	list	The name of a trial defined elsewhere in the script to be run on this block.

Remarks

The integers to the left of the equal signs represent ordinal positions within the sequence of trials. Trials can be directly assigned to a position in the sequence using the equals sign. A trial can be simultaneously assigned to multiple positions by separating the position numbers with commas (equivalent to "and") or dashes (equivalent to "through"). All trial positions in the block must be assigned to a trial or set of trials.

Examples

The first five trials of the following block are practicetrial, and the last five trials are testtrial:

<block myBlock>
/ trials=[1-5=practicetrial; 6-10=testtrial]
</block>

The following block randomly selects either lefttrial or righttrial for each of its ten trials. Both trial types are run exactly five times.

<block myBlock>
/ trials=[1-10=noreplace(lefttrial, righttrial)]
</block>

The following block selects trials one through ten from a list element named 'trialselector' containing a set of trial.

<block myBlock>
/ trials=[1-10=list.trialselector]
</block>

The following block randomly selects either testtrial or distractortrial for each of its 12 trials. The testtrial is run exactly 8 time and distractortrial is run 4 times.

<block myBlock>
/ trials=[1-12=noreplace(testtrial, testtrial, distractortrial)]
</block>

The following block runs bigtrial on even numbered trials and littletrial on odd numbered trials.

<block myBlock>
/ trials=[1,3,5,7,9 = littletrial; 2,4,6,8,10 = bigtrial]
</block>