Related Experiment Video
Updated: Mar 25, 2026

Use of a Video Scoring Anchor for Rapid Serial Assessment of Social Communication in Toddlers
Published on: March 14, 2018
Twins and their singleton siblings differ in language, cognition, and social-emotional development
Emily Wood1, Anna Brown2, Sophie von Stumm3
1Department of Child & Adolescent Psychiatry, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, United Kingdom.
None:
This study compared the language, cognition, and social-emotional development between twins and their younger singleton siblings at the ages 2, 3, 4, and 7 years. Data were collected 1996-2004 from 851 sibling trios from the Twins Early Development Study (TEDS; 50.2% female; 93.2% White British). Distributions were comparable between twins and singletons across domains, indicative of mean rather than variance discrepancies. Twins performed worse than singletons in language, cognition, and social-emotional development across ages, with small to moderate effect sizes (d = 0.17-0.62). An exception was language at age 7 years, when twins exceeded their singleton siblings (d = -0.35). Overall, twins and their singleton siblings differed in development across domains and their differences in language reversed during childhood.
More Related Videos
05:35Experience is Instrumental in Tuning a Link Between Language and Cognition: Evidence from 6- to 7- Month-Old Infants' Object Categorization
Published on: April 19, 2017
11:14A Novel Experimental and Analytical Approach to the Multimodal Neural Decoding of Intent During Social Interaction in Freely-behaving Human Infants
Published on: October 4, 2015
Related Concept Videos
Language and Cognition
Language Development
The critical period for language acquisition suggests that the ability to acquire language is at its peak early in life. As people age, this proficiency decreases. Language development begins very...
Relationship with Other Adult Family Members and Siblings
Socioemotional Development during Infancy
Primary Temperament Types
Cognitive Development During Adolescence
Socioemotional Experience and Gender Development