Adults with dyslexia demonstrate large effects of crowding and detrimental effects of distractors in a visual tilt discrimination task


Previous research has shown that adults with dyslexia (AwD) are disproportionately impacted by close spacing of stimuli and increased numbers of distractors in a visual search task compared to controls [1]. Using an orientation discrimination task, the present study extended these findings to show that even in conditions where target search was not required: (i) AwD had detrimental effects of both crowding and increased numbers of distractors; (ii) AwD had more pronounced difficulty with distractor exclusion in the left visual field and (iii) measures of crowding and distractor exclusion correlated significantly with literacy measures. Furthermore, such difficulties were not accounted for by the presence of covarying symptoms of ADHD in the participant groups. These findings provide further evidence to suggest that the ability to exclude distracting stimuli likely contributes to the reported visual attention difficulties in AwD and to the aetiology of literacy difficulties. The pattern of results is consistent with weaker and asymmetric attention in AwD.

Publication DOI:
Divisions: College of Health & Life Sciences > School of Psychology
College of Health & Life Sciences > Clinical and Systems Neuroscience
College of Health & Life Sciences > Aston Institute of Health & Neurodevelopment (AIHN)
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
Additional Information: Copyright: © 2014 Cassim et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: scholarship from Aston University. Supplementary data at doi:10.1371/journal.pone.0106191.s001
Uncontrolled Keywords: General Agricultural and Biological Sciences,General Biochemistry,Genetics and Molecular Biology,General Medicine
Publication ISSN: 1932-6203
Last Modified: 05 Jul 2024 07:22
Date Deposited: 25 Sep 2014 15:25
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
http://www.plos ... al.pone.0106191 (Publisher URL)
PURE Output Type: Article
Published Date: 2014-09-03
Authors: Cassim, Rizan
Talcott, Joel (ORCID Profile 0000-0001-7958-8369)
Moores, Elisabeth (ORCID Profile 0000-0003-3997-0832)



Version: Published Version

License: Creative Commons Attribution

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