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Updated: Aug 1, 2026

Eye Tracking Young Children with Autism
Published on: March 27, 2012
A retrospective journal-based case study of an infant with autism and his twin
1Department of Psychology, McMasterUniversity, Hamilton, ON, Canada. rutherm@mcmaster.ca
Insights
This study tracked the development of twins, one with autism, from birth to age 4. Early developmental differences in language, social skills, sleep, and pain sensitivity were observed, offering insights into early autism signs.
Area of Science:
- Developmental psychology
- Neurodevelopmental disorders
- Pediatric medicine
Background:
- Autism Spectrum Disorder (ASD) is a complex neurodevelopmental condition.
- Understanding early developmental trajectories is crucial for timely diagnosis and intervention.
- Twin studies offer unique insights into genetic and environmental influences on development.
Observation:
- A longitudinal case study comparing the development of monozygotic twins from prenatal stages to 4 years of age.
- Detailed examination of maternal journals and medical records documented developmental milestones and differences.
- Subtle developmental variations were noted as early as 6 months of age.
Findings:
- Significant divergences in language development, social interaction, sleep patterns, and pain sensitivity between the twins were identified within the first year.
- The twin diagnosed with autism exhibited distinct developmental patterns compared to his unaffected sibling.
- These early-onset differences provide valuable data on the manifestation of autism in infancy.
Implications:
- The findings contribute to refining developmental theories of autism.
- Provides clinically relevant early indicators for identifying potential signs of autism in infants.
- Highlights the importance of early developmental monitoring in high-risk populations, such as twins.
Abstract:
This report describes the development of an infant who was later diagnosed with autism, and a direct comparison of his development to that of his twin, from a prenatal period through the age of 4 years, through the examination of personal journals and medical records kept by the mother of the twins. Examination of these journals revealed several differences in development between the twins, some as early as 6 months of age. In the first year of life, the infants already differed in language development, social development, sleep patterns, and sensitivity to pain. This rare opportunity to view early autistic development gives direction to developmental theories of autism and clinically useful cues to early signs of autism.
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Autism Spectrum Disorder
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.

