The stop command enables a script to specify conditions based on the subject's performance under which the block should be aborted.

Applies to

<block>

Syntax

Parameters

type.name.property	Specifies the property that is evaluated by the condition, where type is the type of element, name is the name of the element on which performance should be evaluated, and property is the performance measure (e.g., "block.practicerun.meanlatency" or "block.testblock.numcorrect").
operator	Specifies the operator for comparing the type.name.property and value parameters. The operator must be one of the following: Operator Definition EQ Equal to GE Greater than or equal to GT Greater than LE Less than or equal to LT Less than NE Not equal to
value	Specifies the value against which property is compared.

Remarks

The stop command enables a script to conditionally end a block based on the subject's performance. You may specify multiple stop commands. After each trial in the block, the stop conditions for the block are evaluated, and if any are true the block is ends. Otherwise, the block continues until the last trial is run.

Examples

The following block is interrupted if the subject gives 5 incorrect answers in a row, or if mean response latency on testtrials drifts above 1000 milliseconds:

<block myblock>
/ trials=[1-20=noreplace(testtrials, distractortrials)]
/ stop=(block.myblock.errorstreak, GE, 5)
/ stop=(trial.testtrials.percentcorrect, GE, 1000)
</block>