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Spatial localisation in autism: evidence for differences in early cortical visual processing

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posted on 2023-07-26, 13:07 authored by Keziah Latham, Susana T. L. Chung, Peter M. Allen, Teresa Tavassoli, Simon Baron-Cohen
Background: Vision in people with autism spectrum conditions (ASC) is reported to be different from people without ASC, but the neural level at which the differences begin to occur is not yet known. Here we examine two variants of a vernier acuity task to determine if differences are evident in early visual processing. Findings: Abutting and separated vernier acuity was assessed in 16 people with ASC and 14 matched controls. In controls, abutting and separated thresholds were unrelated (r = 0.13, p = 0.65), suggesting thresholds are determined by two separate mechanisms. In contrast, the abutting and separated thresholds of ASC observers were strongly correlated (r = 0.88, p < 0.0001), with separated thresholds tending towards being superior to those of controls [t(28) = −2.46, p = 0.02]. Conclusions: The findings suggest the mechanisms employed by ASC observers in separated vernier tasks are different to those of controls. This psychophysical evidence suggests that visual differences in ASC may begin at an early cortical stage of visual processing.

History

Refereed

  • Yes

Volume

4

Issue number

4

Publication title

Molecular Autism

ISSN

2040-2392

Publisher

BioMed Central

File version

  • Published version

Language

  • eng

Legacy posted date

2013-05-28

Legacy creation date

2018-11-01

Legacy Faculty/School/Department

ARCHIVED Faculty of Science & Technology (until September 2018)

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