blockfeedback attribute

The blockfeedback attribute specifies which performance feedback the subject receives at the end of the block.

Member of

Syntax

/ blockfeedback = (metric, metric, metric, ...)

Parameters

metric

One of the following performance metrics:

Value	Description
meanlatency	The average response latency for the block in milliseconds.
medianlatency	The median response latency for the block in milliseconds.
window	The percentage of responses occurring within the response window in the block.
correct	The percentage of correct responses made in the block.

Remarks

If blockfeedback is specified, an special instruction screen appears at the end of the block reporting the subject's performance. If you wish to present additional performance feedback or to customize the appearance of the feedback page, you may do so using instruction pages with variable replacement expressions for the desired performance metrics.

Examples

The following block reports the subject's average latency and percent correct once at the end.

<block myblock>
/ trials=[1-20=noreplace(testtrials, distractortrials)]
/ blockfeedback = (meanlatency, correct)
</block>