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Updated: Aug 10, 2026

A Within-subjects Experimental Protocol to Assess the Effects of Social Input on Infant EEG
Published on: May 3, 2017
Early influences on the school social adjustment of twins
1Department of Genetics and Human Variation, La Trobe University, Bundoora, Victoria, Australia.
Insights
Complications during twin birth, like differing hospital discharge times, can impact child behavior. Teachers observed more withdrawal and depression in twins who came home later, influenced by parental preference.
Area of Science:
- Developmental Psychology
- Twin Studies
- Child Behavior
Background:
- Twin births often involve complications impacting development.
- Parental perceptions can influence observed child behavior.
- Investigating long-term effects of birth complications on twins is crucial.
Purpose of the Study:
- To assess long-term behavioral effects of twin birth complications.
- To determine if teachers can observe these effects.
- To explore the role of parental preference in observed differences.
Main Methods:
- Utilized data from the La Trobe Twin Study.
- Teachers completed the Bristol Social Adjustment Guide for children aged 5-16.
- Correlated birth complications and hospital discharge order with behavioral assessments.
Main Results:
- Extreme prematurity and delivery issues linked to 'Underreaction syndrome' (withdrawal, depression).
- Twins discharged later showed more withdrawal, depression, and peer maladjustment.
- Parental preference for the first-home twin mediated these effects.
Conclusions:
- Separating twins' hospital discharge times may negatively impact behavior.
- Parental bias can influence behavioral outcomes in twins.
- These factors are critical intervening variables in twin studies.
Abstract:
The birth of twins is often accompanied by complications which may affect both twins equally (eg, prematurity) or which may establish differences between the twins (eg, one coming home from hospital first). Parents' ratings of behaviour may reflect and even perpetuate the influence of such variables and it is of interest to see if people less familiar with the twins' history can observe any long-term effects. In the La Trobe Twin Study teachers routinely complete the Bristol Social Adjustment Guide, an assessment of social maladjustment in children aged 5-16 years. Extreme prematurity and problems at delivery were generally associated with the Underreaction syndrome--the child who is unforthcoming, withdrawn and depressed. Withdrawal, depression and maladaptive behaviour to classroom peers were much more common among those twins discharged from hospital after the cotwin. A major mediating factor was that the parents admitted to greatly preferring the one to come home first. These raise questions both about the practice of bringing twins home separately (which occurred in 21% of the cases) and about intervening variables in studies of personality and temperament.
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