Lookup NU author(s): Dr Ignacio Serrano-Pedraza,
Dr Kathleen Vancleef,
Professor Jenny Read
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
PURPOSE. Human vision has a puzzling stereoscopic anisotropy: horizontal depth corrugations are easier to detect than vertical depth corrugations. To date, little is known about the function or the underlying mechanism responsible for this anisotropy. Here, we aim to find out whether this anisotropy is independent of age. To answer this, we compare detection thresholds for horizontal and vertical depth corrugations as a function of age.METHODS. The depth corrugations were defined solely by the horizontal disparity of random dot patterns. The disparities depicted a horizontal or vertical sinusoidal depth corrugation of spatial frequency 0.1 cyc/deg. Detection thresholds were obtained using Bayesian adaptive staircases from a total of 159 subjects aged from 3 to 73 years. For each participant we computed the anisotropy index, defined as the log10-ratio of the detection threshold for vertical corrugations divided by that for horizontal.RESULTS. Anisotropy index was highly variable between individuals but was positive in 87% of the participants. There was a significant correlation between anisotropy index and log-age (r = 0.21, P = 0.008) mainly driven by a significant difference between children and adults. In 67 children aged 3 to 13 years, the mean anisotropy index was 0.34 +/- 0.38 (mean +/- SD, meaning that vertical thresholds were on average 2.2 times the horizontal ones), compared with 0.59 +/- 0.55 in 84 adults aged 18 to 73 years (vertical 3.9 times horizontal). This was mainly driven by a decline in the sensitivity to vertical corrugations. Children had poorer stereoacuity than adults, but had similar sensitivity to adults for horizontal corrugations and were actually more sensitive than adults to vertical corrugations.CONCLUSIONS. The fact that adults show stronger stereo anisotropy than children raises the possibility that visual experience plays a critical role in developing and strengthening the stereo anisotropy.
Author(s): Serrano-Pedraza I, Herbert W, Villa-Laso L, Widdall M, Vancleef K, Read JCA
Publication type: Article
Publication status: Published
Journal: Investigative Ophthalmology & Visual Science
Print publication date: 01/03/2016
Acceptance date: 29/12/2015
Date deposited: 08/07/2016
ISSN (print): 0146-0404
ISSN (electronic): 1552-5783
Publisher: Association for Research in Vision and Ophthalmology
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