New Light on the Mind’s Eye

The eye’s pupils constrict (shrink) in brightness and dilate (expand) in darkness. The pupillary light response was historically considered a low-level reflex without any cognitive component. Here, we review recent studies that have dramatically changed this view: The light response depends not only on a stimulus’s brightness but also on whether you are aware of the stimulus, whether you are paying attention to it, and even whether you are thinking about it. We highlight the link between the pupillary light response and eye-movement preparation: When you intend to look at a bright stimulus, a pupillary constriction is prepared along with the eye movement before the eyes set in motion. This preparation allows the pupil to rapidly change its size as your eyes move from bright to dark objects and back again. We discuss the implications of these recent advances for our understanding of the subtle yet important role that pupillary responses play in vision.

[1]  G. Rizzolatti,et al.  Reorienting attention across the horizontal and vertical meridians: Evidence in favor of a premotor theory of attention , 1987, Neuropsychologia.

[2]  S. Sirois,et al.  Pupillometry , 2012, Perspectives on psychological science : a journal of the Association for Psychological Science.

[3]  M. Just,et al.  The intensity dimension of thought: pupillometric indices of sentence processing. , 1993, Canadian journal of experimental psychology = Revue canadienne de psychologie experimentale.

[4]  J. Grainger,et al.  The Pupillary Light Response Reveals the Focus of Covert Visual Attention , 2013, PloS one.

[5]  Jonathan Grainger,et al.  The pupillary light response reflects exogenous attention and inhibition of return. , 2014, Journal of vision.

[6]  B. Laeng,et al.  The Eye Pupil Adjusts to Imaginary Light , 2014, Psychological science.

[7]  Jonathan Grainger,et al.  The pupillary light response reflects eye-movement preparation. , 2014, Journal of experimental psychology. Human perception and performance.

[8]  B. Goldwater.  Psychological significance of pupillary movements. , 1972, Psychological bulletin.

[9]  P. Binda,et al.  Pupil size reflects the focus of feature-based attention. , 2014, Journal of neurophysiology.

[10]  Allen Allport,et al.  Visual attention , 1989 .

[11]  George A. Alvarez,et al.  Tracking the allocation of attention using human pupillary oscillations , 2013, Front. Psychol..

[12]  Paola Binda,et al.  Attention to Bright Surfaces Enhances the Pupillary Light Reflex , 2013, The Journal of Neuroscience.

[13]  Wolfgang Einhäuser,et al.  Perceptual Rivalry: Reflexes Reveal the Gradual Nature of Visual Awareness , 2011, PloS one.

[14]  M. Carrasco.  Visual attention: The past 25 years , 2011, Vision Research.

[15]  Jeremy M Wolfe,et al.  Visual Attention , 2020, Computational Models for Cognitive Vision.

[16]  F. Campbell,et al.  Effect of Size of Pupil on Visual Acuity , 1960, Nature.

[17]  I. E. Loewenfeld.  Mechanisms of reflex dilatation of the pupil , 2004, Documenta Ophthalmologica.

[18]  B. Laeng,et al.  Bright illusions reduce the eye's pupil , 2012, Proceedings of the National Academy of Sciences.

[19]  J. Beatty.  Task-evoked pupillary responses, processing load, and the structure of processing resources. , 1982, Psychological bulletin.

[20]  Paola Binda,et al.  Pupil constrictions to photographs of the sun. , 2013, Journal of vision.

[21]  Jonathan D. Cohen,et al.  An integrative theory of locus coeruleus-norepinephrine function: adaptive gain and optimal performance. , 2005, Annual review of neuroscience.

[22]  Ken Nakayama,et al.  Pupil responses to high-level image content. , 2013, Journal of vision.

[23]  F. W. Campbell,et al.  The role of the pupil light reflex in aiding adaptation to the dark , 1975, Vision Research.

[24]  R. Douglas,et al.  The pupillary response of cephalopods , 2005, Journal of Experimental Biology.

[25]  D. Harms.  Ort und Wesen der Bildhemmung bei Schielenden , 1937, Albrecht von Graefes Archiv für Ophthalmologie.