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How the External Visual Noise Affects Motion Direction Discrimination in Autism Spectrum Disorder
Nadejda Bocheva1, Ivan Hristov1, Simeon Stefanov1
1Department of Sensory Neurobiology, Institute of Neurobiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
Behavioral Sciences (Basel, Switzerland)
|April 21, 2022
Summary
Individuals with Autism Spectrum Disorder (ASD) show greater variability and poorer performance in integrating visual motion information compared to typically developing individuals. This suggests challenges in processing global motion perception in ASD.
Area of Science:
- Neuroscience
- Developmental Psychology
- Visual Perception
Background:
- Autism Spectrum Disorder (ASD) is characterized by social, cognitive, and behavioral differences, alongside sensory processing atypicalities.
- Previous research suggests potential global motion processing deficits in ASD, though findings remain debated.
Purpose of the Study:
- To compare global motion integration abilities in children and adolescents with ASD versus typically developing (TD) individuals.
- To investigate the effect of external noise on motion discrimination using a low-density display and the equivalent noise (EN) approach.
Main Methods:
- Fifty-seven participants (ASD and TD) identified the average direction of 30 micro-patterns under varying noise levels.
- The equivalent noise paradigm was employed to quantify motion discrimination thresholds.
Main Results:
- The ASD group exhibited significantly larger individual differences in motion direction thresholds compared to the TD group.
- Global motion direction discrimination thresholds were elevated in ASD individuals across all tested noise levels.
Conclusions:
- Individuals with ASD demonstrate a reduced capacity for integrating local motion cues into a global percept, particularly in low-density visual displays.
- These findings highlight specific visual processing differences in ASD, contributing to the understanding of sensory atypicalities.
