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Orientation-specific surround suppression in the primary visual cortex varies as a function of autistic tendency
Anastasia V Flevaris1, Scott O Murray1
1Department of Psychology, University of Washington Seattle, WA, USA.
Frontiers in Human Neuroscience
|January 23, 2015
Summary
Neurotypical individuals with higher autistic traits show reduced visual surround suppression in the brain's primary visual cortex (V1). This suggests a neural basis for altered visual processing in autism spectrum disorder (ASD).
Area of Science:
- Neuroscience
- Visual Perception
- Autism Spectrum Disorder Research
Background:
- Individuals with autism spectrum disorder (ASD) often show enhanced local visual processing but impaired global integration.
- Perceptual abnormalities in ASD are linked to atypical visual cortex function, but neural mechanisms remain unclear.
- Orientation-specific surround suppression in the visual cortex is a key contextual modulation process potentially relevant to ASD.
Purpose of the Study:
- To investigate the relationship between autistic tendency and orientation-specific surround suppression in the primary visual cortex (V1) of neurotypical individuals.
- To determine if neural mechanisms underlying visual processing differences in ASD are present in the general population.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to measure neural responses in V1.
- Participants viewed Gabor stimuli with same or orthogonal orientations in the surround.
- A suppression index (SI) was calculated to quantify orientation-specific surround suppression.
Main Results:
- The suppression index (SI) was positively correlated with autistic tendency, as measured by the Autism Quotient (AQ) scale.
- Age also correlated with SI and autistic tendency, but did not explain the SI-autistic tendency link.
- Results indicate reduced orientation-specific surround suppression in V1 with increasing autistic tendency.
Conclusions:
- Orientation-specific surround suppression in V1 is reduced in neurotypical individuals with higher autistic traits.
- This finding suggests a potential neural mechanism contributing to the visual processing differences observed in autism spectrum disorder.
- The study links a specific visual cortical mechanism to autistic traits in the general population.
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