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Chromatic Perceptual Learning but no Category Effects without Linguistic Input

Grandison, A, Sowden, PT, Drivonikou, VG, Notman, LA, Alexander, I and Davies, IR (2016) Chromatic Perceptual Learning but no Category Effects without Linguistic Input Frontiers in Psychology, 7.

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Perceptual learning involves an improvement in perceptual judgment with practice, which is often specific to stimulus or task factors. Perceptual learning has been shown on a range of visual tasks but very little research has explored chromatic perceptual learning. Here, we use two low level perceptual threshold tasks and a supra-threshold target detection task to assess chromatic perceptual learning and category effects. Experiment 1 investigates whether chromatic thresholds reduce as a result of training and at what level of analysis learning effects occur. Experiment 2 explores the effect of category training on chromatic thresholds, whether training of this nature is category specific and whether it can induce categorical responding. Experiment 3 investigates the effect of category training on a higher level, lateralized target detection task, previously found to be sensitive to category effects. The findings indicate that performance on a perceptual threshold task improves following training but improvements do not transfer across retinal location or hue. Therefore, chromatic perceptual learning is category specific and can occur at relatively early stages of visual analysis. Additionally, category training does not induce category effects on a low level perceptual threshold task, as indicated by comparable discrimination thresholds at the newly learned hue boundary and adjacent test points. However, category training does induce category effects on a supra-threshold target detection task. Whilst chromatic perceptual learning is possible, learnt category effects appear to be a product of left hemisphere processing, and may require the input of higher level linguistic coding processes in order to manifest.

Item Type: Article
Subjects : subj_Psychology
Divisions : Faculty of Health and Medical Sciences > School of Psychology
Authors :
Grandison, A
Sowden, PT
Drivonikou, VG
Notman, LA
Alexander, I
Davies, IR
Date : 2 May 2016
Funders : Economic and Social Research Council
DOI : 10.3389/fpsyg.2016.00731
Copyright Disclaimer : © 2016 Grandison, Sowden, Drivonikou, Notman, Alexander and Davies. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 12 May 2016 12:26
Last Modified : 11 Dec 2018 11:22

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