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Postural hypo-reactivity in autism is contingent on development and visual environment: a fully immersive virtual
Selma Greffou1, Armando Bertone, Eva-Maria Hahler
1Visual Psychophysics and Perception Laboratory, School of Optometry, University of Montreal, 3744 Jean-Brillant street, Montreal, QC H3T 1P1, Canada.
Journal of Autism and Developmental Disorders
|July 14, 2011
Summary
Autism is linked to atypical postural reactivity, especially in younger individuals responding to visual stimuli. This study reveals that visual input and age influence how autistic people maintain balance.
Area of Science:
- Neuroscience
- Developmental Psychology
- Biomechanics
Background:
- Atypical motor behaviors are common in autism spectrum disorder (ASD).
- The underlying causes of these motor differences, particularly in postural control, remain under-investigated.
- Understanding sensory contributions to motor function is crucial for ASD research.
Purpose of the Study:
- To investigate the role of visual and vestibular systems in atypical postural reactivity in autistic individuals.
- To examine how age and visual environments affect postural responses in autism.
- To identify developmental differences in postural stability among autistic and typically developing populations.
Main Methods:
- Postural reactivity and stability were measured in younger (12-15 years) and older (16-33 years) autistic and typically developing participants.
- Participants were exposed to a virtual tunnel oscillating at varying frequencies.
- Postural responses were analyzed under different visual conditions (dynamic, static, and no visual input).
Main Results:
- Younger autistic participants exhibited significantly less instability than their typically developing peers at high oscillation frequencies.
- No significant differences in postural instability were observed between older autistic and typically developing participants.
- No significant group differences in postural behavior were found under static or no visual information conditions.
Conclusions:
- Autistic individuals demonstrate hypo-reactivity to visual stimuli affecting postural control.
- This visual hypo-reactivity is dependent on the dynamic nature of the visual environment.
- Developmental stage significantly modulates the relationship between visual input and postural stability in autism.
