Abstract

In addition to the pupil light reflex response (PLR), recent investigations have shown that systematic pupillary changes can be induced by changing certain stimulus attributes such as spatial structure and colour which are normally associated with central stages of visual processing¹. For example, systematic pupillary responses have been demonstrated as a function of check size in experiments with checker-board patterns^2,3, temporal modulation frequency with uniform fields^4,5 and as a function of stimulus wavelength⁶ or the temporal exchange of monochromatic lights^7,8.

© 1991 Optical Society of America