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Chang-Bing Huang, Zhong-Lin Lu, Yifeng Zhou; Mechanisms underlying perceptual learning of contrast detection in adults with anisometropic amblyopia. Journal of Vision 2009;9(11):24. doi: https://doi.org/10.1167/9.11.24.
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© ARVO (1962-2015); The Authors (2016-present)
What underlies contrast sensitivity improvements in adults with anisometropic amblyopia following perceptual learning in grating contrast detection? In this paper, we adopted the external noise approach (Z.-L. Lu & B. A. Dosher, 1998) to identify the mechanisms underlying perceptual learning in adults with anisometropic amblyopia. By measuring contrast thresholds in a range of external noise conditions at two performance levels (79.3% and 70.7%), we found that a mixture of internal additive noise reduction and external noise exclusion underlay training induced contrast sensitivity improvements in adults with anisometropic amblyopia. In comparison, normal adults exhibited only small amount of external noise exclusion under the same training conditions. The results suggest that neural plasticity may be more robust in amblyopia, lending further support of perceptual learning as a potential treatment for adult amblyopia.
Note: aVisual acuity in LogMAR unit was assessed with the Chinese Tumbling E Chart (Mou, 1966) and defined as the score associated with 75% correct judgments. SF, spatial frequency.
Note: A a, changes in internal additive noise; A f, changes in the impact of external noise; full model: changes in both A a and A f. A a(1) = 1, A f(1) = 1. * p < 0.05; † p < 0.01; ‡ p < 0.001; #0.05 < p < 0.10.
Note: A a, changes in internal additive noise; A f, changes in the impact of external noise; full model: changes in both A a and A f. A a(1) = 1, A f(1) = 1. * p < 0.05; † p < 0.01.
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