The Journal of General Physiology
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The Journal of General Physiology, Vol 47, 265-278, Copyright © 1963 by The Rockefeller University Press

ARTICLE

The Dependence of the Photopupil Response on Flash Duration and Intensity

Mathew Alpern 1, Donald W. McCready Jr. 1, and Lloyd Barr 1

1 From the Departments of Ophthalmology and Physiology, The University of Michigan, Ann Arbor

The changes in pupil size were recorded by infrared pupillographic methods in response to light flashes of different durations and intensities for a 13 degree 34 minute centrally fixated circular field. For such stimuli, the threshold intensities for (rod) vision and for the pupil response were found to be about the same. The response amplitudes were related to the logarithm of the flash energy, the reciprocity law remaining valid up to about one-half second. The curve relating flash energy and pupil response was clearly divisible into two parts commensurate with the duplex character of the human retina. A similar dichotomy appears in curves relating response amplitude to response latency. Since the pupil response is determined by total flash energy, intense long flashes produce larger pupil responses than shorter (and perceptually brighter) ones of the same intensity.

Submitted on April 8, 1963


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