Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36770
Title: Perceiving polarization with the naked eye: characterization of human polarization sensitivity
Authors: McGregor, Juliette Elizabeth
Temple, S. E.
Miles, C.
Graham, L.
Miller, J.
Buck, J.
Scott-Samuel, N. E.
Roberts, N. W.
First Published: 1-Jul-2015
Citation: Proceedings of the Royal Society B: Biological Sciences, 2015, 282(1811), 20150338
Abstract: Like many animals, humans are sensitive to the polarization of light. We can detect the angle of polarization using an entoptic phenomenon called Haidinger's brushes, which is mediated by dichroic carotenoids in the macula lutea. While previous studies have characterized the spectral sensitivity of Haidinger's brushes, other aspects remain unexplored. We developed a novel methodology for presenting gratings in polarization-only contrast at varying degrees of polarization in order to measure the lower limits of human polarized light detection. Participants were, on average, able to perform the task down to a threshold of 56%, with some able to go as low as 23%. This makes humans the most sensitive vertebrate tested to date. Additionally, we quantified a nonlinear relationship between presented and perceived polarization angle when an observer is presented with a rotatable polarized light field. This result confirms a previous theoretical prediction of how uniaxial corneal birefringence impacts the perception of Haidinger's brushes. The rotational dynamics of Haidinger's brushes were then used to calculate corneal retardance. We suggest that psychophysical experiments, based upon the perception of polarized light, are amenable to the production of affordable technologies for self-assessment and longitudinal monitoring of visual dysfunctions such as age-related macular degeneration.
DOI Link: 10.1098/rspb.2015.0338
ISSN: 0962-8452
eISSN: 1471-2954
Links: http://rspb.royalsocietypublishing.org/content/282/1811/20150338
http://hdl.handle.net/2381/36770
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Neuroscience, Psychology and Behaviour

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