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Visual Noise Effect on Contour Integration and Gaze Allocation in Autism Spectrum Disorder
Milena Slavcheva Mihaylova1, Nadejda Bogdanova Bocheva1, Tsvetalin Totev Totev1
1Department of Sensory Neurobiology, Institute of Neurobiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
Frontiers in Neuroscience
|February 26, 2021
Summary
Individuals with Autism Spectrum Disorder (ASD) show impaired contour integration, performing less accurately and slower, especially with increased visual noise. This suggests difficulties with visual processing and noise filtering in ASD.
Area of Science:
- Neuroscience
- Psychology
- Developmental Science
Background:
- Contradictory findings exist regarding contour integration in Autism Spectrum Disorders (ASD).
- Understanding visual processing limitations in ASD is crucial for targeted interventions.
Purpose of the Study:
- To investigate factors limiting contour integration in ASD.
- To examine the impact of external visual noise on contour integration in ASD using psychophysical and eye-tracking methods.
Main Methods:
- A Yes/No detection task involving contour elements amidst Gabor stimuli.
- Utilized psychophysical testing and eye-tracking in 24 children/adolescents with ASD and 32 typically developing controls.
- Employed a double-pass experiment to assess response consistency and accuracy under varying noise levels.
Main Results:
- ASD group exhibited significantly slower and less accurate responses across all noise levels.
- Increased external noise disproportionately affected ASD participants' performance and response consistency.
- Eye-tracking revealed a larger gaze allocation area in the ASD group, indicating potential positional uncertainty.
Conclusions:
- ASD individuals demonstrate reduced efficiency in using visual stimulus information, potentially due to fixation instability and difficulties filtering external noise.
- Findings suggest higher positional uncertainty and interference from noise elements in ASD, impacting contour integration.
- These results highlight specific visual processing challenges in ASD that warrant further investigation.
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Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
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