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Title: Sharpening coarse-to-fine stereo vision by perceptual learning : asymmetric transfer across the spatial frequency spectrum
Authors: Li, RW
Tran, TT
Craven, AP
Leung, TW 
Chat, SW
Levi, DM
Issue Date: Jan-2016
Source: Royal Society open science, Jan. 2016, v. 3, no. 1, 150523
Abstract: Neurons in the early visual cortex are finely tuned to different low-level visual features, forming a multi-channel system analysing the visual image formed on the retina in a parallel manner. However, little is known about the potential ‘cross-talk’ among these channels. Here, we systematically investigated whether stereoacuity, over a large range of target spatial frequencies, can be enhanced by perceptual learning. Using narrow-band visual stimuli, we found that practice with coarse (low spatial frequency) targets substantially improves performance, and that the improvement spreads from coarse to fine (high spatial frequency) three-dimensional perception, generalizing broadly across untrained spatial frequencies and orientations. Notably, we observed an asymmetric transfer of learning across the spatial frequency spectrum. The bandwidth of transfer was broader when training was at a high spatial frequency than at a low spatial frequency. Stereoacuity training is most beneficial when trained with fine targets. This broad transfer of stereoacuity learning contrasts with the highly specific learning reported for other basic visual functions. We also revealed strategies to boost learning outcomes ‘beyond-the-plateau’. Our investigations contribute to understanding the functional properties of the network subserving stereovision. The ability to generalize may provide a key principle for restoring impaired binocular vision in clinical situations.
Keywords: Generalization
Specificity
Stereopsis
Vision enhancement
Visual plasticity
Publisher: Royal Society
Journal: Royal Society open science 
ISSN: 2054-5703
DOI: 10.1098/rsos.150523
Rights: © 2016 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.
The following publication Li, R. W., Tran, T. T., Craven, A. P., Leung, T. W., Chat, S. W., & Levi, D. M. (2016). Sharpening coarse-to-fine stereo vision by perceptual learning: asymmetric transfer across the spatial frequency spectrum. Royal Society open science, 3(1), 150523 is available at https://doi.org/10.1098/rsos.150523
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