The effect of training on visual alignment discrimination and grating resolution |
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Authors: | Robert G. Bennefl Gerald Westheimer |
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Affiliation: | 1. Division of Neurobiology, Department of Molecular and Cell Biology, University of California, 94720, Berkeley, CA
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Abstract: | The effect of training on an observer’s ability to detect the misalignment of three points, a hypes-acuity, and to resolve a six-line grating was studied in a transfer-of-training design with observers (4 in each of two experiments) who were experienced in making psychophysical judgments of other visual stimuli. The transfer-of-training design enabled us to look for any training-based improvement. Long periods of training produced no statistically significant improvement in performance under any condition. There were small practice-based improvements, but the primary patterns indicated threshold fluctuation rather than improvement. We interpret the results to indicate that the neural mechanisms underlying three-point alignment and grating discrimination, like those for gap bisection (Klein & Levi, 1985), are not malleable to any significant extent. |
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