New PDF release: Psychophysiology 48(3)

By Robert F. Simons (Ed.)

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The Tobii 1750 measures the size of a participant’s pupil by fitting an ellipse to the pupil image then converting the width of the major axis of that ellipse from pixels to millimeters based on the measured distance from the camera to the pupil. Due to inaccuracy in this measurement of camera–pupil distance, measurements of absolute pupil size may have errors of up to 5%, but sample-tosample changes in pupil diameter are much more accurate. This better accuracy for relative measures makes eye trackers well suited for cognitive pupillometry, where the measurement of interest is usually changes in pupil diameter relative to their diameter at the end of an accommodation period preceding each trial (Beatty & Lucero-Wagoner, 2000).

Libby, W. , Lacey, B. , & Lacey, J. I. (1973). Pupillary and cardiac activity during visual attention. Psychophysiology, 10, 270–294. Loewenfeld, I. (1999). , Vol. 1). Oxford, UK: Butterworth-Heinemann. Loewy, A. D. (1990). Autonomic control of the eye. In A. D. Loewy & K. M. ), Central regulation of autonomic functions (pp. 268–285). New York: Oxford University Press. Logie, R. , Gilhooly, K. , & Wynn, V. (1994). Counting on working memory in arithmetic problem solving. Memory & Cognition, 22, 395–410.

Each trial of Experiment 3 had three moments at which we told participants to expect possible targets, which occurred independently at each moment with probability one half. The chart on the left shows the mean dilation in moments in which a target did not occur, and the chart on the right shows the mean dilation in moments when a target did occur. 5 s after target presentation. This secondary peak corresponds to the motor activity of responding to the target’s presence. Whether a target was present or absent, dilations were larger in the aural condition, and the peak dilation under aural presentation occurred about half a second later than with visual presentation.

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Psychophysiology 48(3) by Robert F. Simons (Ed.)

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