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When a light stimulus covers the human natural blind spot (BS), perceptual filling-in corrects for the missing information inside the BS. Here, we examined whether a filled-in surface of light perceived inside the BS affects the size of the short-latency pupillary light reflex (PLR), a pupil response mediated by a subcortical pathway for unconscious vision. The PLR was not induced by a red surface that was physically absent but perceptually filled-in inside the BS in the presence of a red ring surrounding it. However, a white large disk covering the BS unexpectedly induced a larger PLR than a white ring surrounding the BS border did, even though these two stimuli must be equivalent for the visual system, and trial-by-trial percepts did not predict PLR size. These results suggest that some physiological mechanism, presumably the retinal cells containing the photopigment melanopsin, receives the light projected inside the BS and enhances PLR.

Original publication

DOI

10.1038/srep11862

Type

Journal article

Journal

Sci Rep

Publication Date

26/06/2015

Volume

5

Keywords

Adolescent, Adult, Analysis of Variance, Humans, Light, Optic Disk, Photoreceptor Cells, Vertebrate, Pupil, Reflex, Pupillary, Retina, Rod Opsins, Time Factors, Vision, Ocular, Young Adult