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Stereotyped motor behaviors associated with autism in high-risk infants: a pilot videotape analysis of a sibling
Alvin Loh1, Teesta Soman, Jessica Brian
1The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada.
Insights
Infant siblings later diagnosed with autism spectrum disorder (ASD) showed more frequent "arm waving" motor behaviors. Overlap in stereotyped movements existed between ASD and non-diagnosed siblings compared to controls.
Area of Science:
- Developmental Psychology
- Neurodevelopmental Disorders
- Autism Spectrum Disorder (ASD) Research
Background:
- Early identification of autism spectrum disorder (ASD) is crucial for timely intervention.
- Motor behaviors and stereotypies in infancy may serve as early indicators of neurodevelopmental differences.
- Understanding motor patterns in infant siblings of children with ASD can provide insights into early risk factors.
Purpose of the Study:
- To investigate and compare motor behaviors, specifically stereotypies, in infant siblings at high familial risk for ASD.
- To examine the frequency and types of stereotypic movements and postures at 12 and 18 months of age.
- To identify potential early behavioral markers differentiating siblings who later develop ASD from those who do not.
Main Methods:
- Longitudinal study of infant siblings of children diagnosed with ASD.
- Standardized observational assessments were conducted at 12 and 18 months.
- Videotapes of motor behaviors, including stereotypic movements and postures, were coded blind to diagnostic outcome.
Main Results:
- Infants later diagnosed with autism spectrum disorder (ASD) exhibited more frequent 'arm waving' at both 12 and 18 months.
- The posture 'hands to ears' was observed more frequently in both the ASD group and the non-diagnosed sibling group at 18 months compared to controls.
- Significant overlap was noted in the repertoire of stereotyped behaviors between siblings later diagnosed with ASD and comparison groups.
Conclusions:
- Specific motor behaviors like 'arm waving' may be early indicators in infants at high risk for ASD.
- The presence of certain stereotypies in non-diagnosed siblings suggests a broader spectrum of early motor differences in at-risk families.
- While some motor differences exist, considerable overlap in stereotyped behaviors highlights the complexity of early ASD detection based solely on motor patterns.
Abstract:
This study examined motor behaviors in a longitudinal cohort of infant siblings of children with autism. Stereotypic movements and postures occurring during standardized observational assessments at 12 and 18 months were coded from videotapes. Participants included eight infant siblings later diagnosed with autism spectrum disorder (ASD), a random sample of nine non-diagnosed siblings, and 15 controls. Videos were coded blind to diagnostic group. At 12 and 18 months the ASD group "arm waved" more frequently and at 18 months, one posture ("hands to ears") was more frequently observed in the ASD and non-diagnosed group compared to the controls. Overall, the siblings subsequently diagnosed with ASD and the comparison groups had considerable overlap in their repertoires of stereotyped behaviors.
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