Human and macaque pupil responses driven by melanopsin-containing retinal ganglion cells

Academic Article


  • Melanopsin, a novel photopigment, has recently been localized to a population of retinal ganglion cells that display inherent photosensitivity. During continuous light and following light offset, primates are known to exhibit sustained pupilloconstriction responses that resemble closely the photoresponses of intrinsically-photoreceptive ganglion cells. We report that, in the behaving macaque, following pharmacological blockade of conventional photoreceptor signals, significant pupillary responses persist during continuous light and following light offset. These pupil responses display the unique spectral tuning, slow kinetics, and irradiance coding of the sustained, melanopsin-derived ganglion cell photoresponses. We extended our observations to humans by using the sustained pupil response following light offset to document the contribution of these novel ganglion cells to human pupillary responses. Our results indicate that the intrinsic photoresponses of intrinsically-photoreceptive retinal ganglion cells play an important role in the pupillary light reflex and are primarily responsible for the sustained pupilloconstriction that occurs following light offset. © 2006 Elsevier Ltd. All rights reserved.
  • Authors

    Published In

  • Vision Research  Journal
  • Digital Object Identifier (doi)

    Author List

  • Gamlin PDR; McDougal DH; Pokorny J; Smith VC; Yau KW; Dacey DM
  • Start Page

  • 946
  • End Page

  • 954
  • Volume

  • 47
  • Issue

  • 7