The average width of the participant's pupil as reported by the eye tracker.
<eyetracker> <eyetracker> <eyetracker>
This property returns the average width of the participant's pupil during a given trial.
The following displays the value of meanpupilwidth in a text stimulus:
<text sometext>
/ items= ("height = <% eyetracker.meanpupilwidth %>")
</text>