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Cited by 166Autism Spectrum Disorder ResearchNeural dynamics and brain functionVisual perception and processing mechanisms

The DOI matches its Crossref record; 71 of the 73 references it cites were found in a registry or an index.

Gamma Abnormalities During Perception of Illusory Figures in Autism

Brown, Caroline, Gruber, Thomas, Boucher, Jill, Rippon, Gina, Brock, Jon·2005·Cortex
DOI 10.1016/s0010-9452(08)70273-9
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Abstract

This experiment was designed to test the hypothesis that perceptual abnormalities in autism might be associated with alteration of induced gamma activity patterns overlying visual cortical regions. EEG was recorded from six adolescents with autism and eight controls matched on chronological age, and verbal and nonverbal mental age, whilst identifying the presence or absence of an illusory Kanizsa shape. Although there were no reaction time or accuracy differences between the groups there were significant task-related differences in cortical activity. Control participants showed typical gamma-band activity over parietal regions at around 350 msec post onset of shape trials, similar to gamma patterns found in previous studies with non-impaired adults. In contrast, autistic participants showed overall increased activity, including an early 100 msec gamma peak and a late induced peak, 50 to 70 msec earlier than that shown by the control group. We interpret the abnormal gamma activity to reflect decreased "signal to noise" due to decreased inhibitory processing. In this experiment we did not establish a link between altered perception and abnormal gamma, as the autistic participants' behaviour did not differ from the controls. Future work should be designed to replicate this phenomenon and establish the perceptual consequences of altered gamma activity.

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Research works printed but not linked: 2

  1. Lowenhard, 1972, Study of Witkin's visual discrimination test and its electroencephalographic concomitants, Journal de Psychologie Normale et Pathologique, 4, 427
  2. Tallon-Baudry, 1998, Evoked and induced 40 Hz visual responses in man: From feature binding to selective attention, Journal of Psychophysiology, 12, 193

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Metadata

Authors
Brown, C., Gruber, T., Boucher, J., Rippon, G., & Brock, J.
Affiliations
  • University of the West of England (GB)
  • Leipzig University (DE)
  • University of Warwick (GB)
  • Aston University (GB)
Corresponding author
Brown, Caroline
ORCID
Venue
Cortex
Publisher
Elsevier BV
Published
2005-01
Volume
41
Issue
3
Pages
364-376
ISSN
0010-9452 (ISSN-L)
DOI
10.1016/s0010-9452(08)70273-9
OpenAlex
W2030713803
Cited by
166
References
73
Citations by year
2026: 1 · 2025: 3 · 2023: 5 · 2022: 5 · 2021: 8 · 2020: 15 · 2019: 7 · 2018: 4 · 2017: 6 · 2016: 12 · 2015: 11 · 2014: 9 · 2013: 15 · 2012: 14
FWCI
4.61
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Cortex (publishedVersion)
  • PubMed (publishedVersion)
Funders
British Psychological Society
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
Keywords
autism spectrum disorder, gamma oscillations, illusory contours, Kanizsa figures, visual perception, parietal cortex, signal-to-noise ratio, inhibitory processes, adolescents
MeSH terms
Adolescent, Attention, Autistic Disorder, Child, Cognition, Electroencephalography, Female, Form Perception, Humans, Male, Optical Illusions, Pattern Recognition, Visual, Reaction Time, Visual Perception, Wechsler Scales

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