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Updated: Jun 30, 2025

Testing Sensory and Multisensory Function in Children with Autism Spectrum Disorder
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When does perceptual organization happen?

Alexis D J Makin1, Ned Buckley1, Emma Austin1

  • 1Department of Psychological Sciences, University of Liverpool, Liverpool, United Kingdom.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|March 16, 2024
PubMed
Summary
This summary is machine-generated.

The brain rapidly processes visual symmetry, generating a brainwave called the Sustained Posterior Negativity (SPN). Even when distracted, this symmetry response is never fully abolished, suggesting an evolved adaptation.

Keywords:
EEGERPReflectionSustained Posterior NegativitySymmetry

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Reflectional symmetry is a key visual cue for how the brain organizes perception.
  • Previous research indicates symmetry activates the extrastriate cortex, producing the Sustained Posterior Negativity (SPN) event-related potential.
  • It was previously suggested that no task can completely block symmetry processing and eliminate the SPN.

Purpose of the Study:

  • To investigate the limits of symmetry processing and the Sustained Posterior Negativity (SPN) response.
  • To determine if attentional tasks can abolish the SPN.
  • To explore the persistence of symmetry detection in the human brain.

Main Methods:

  • Conducted eight Electroencephalography (EEG) experiments with 344 participants.
  • Utilized symmetrical and asymmetrical dot patterns across all experiments.
  • Manipulated participant attention to various tasks, including regularity, luminance discrimination, and superimposed stimuli.

Main Results:

  • A significant SPN was observed when participants attended to regularity.
  • The SPN was reduced, but not eliminated, across various tasks, including luminance discrimination, aspect ratio discrimination, and processing superimposed words.
  • The SPN persisted even when background patterns were disruptive or participants focused on unrelated visual elements.

Conclusions:

  • Attentional tasks can modulate, but not abolish, extrastriate symmetry activation and the SPN.
  • The brain appears to maintain a persistent readiness to detect reflectional symmetry.
  • This constant symmetry detection may represent an evolved adaptive mechanism for visual processing.