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1
Common DNA markers can account for more than half of the genetic influence on cognitive abilities
In: Psychological Science , 24 (4) 562 - 568. (2013) (2013)
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2
Genetic and environmental influence on language impairment in 4-year-old same-sex and opposite-sex twins.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2004)
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3
Outcomes of early language delay: I. Predicting persistent and transient language difficulties at 3 and 4 years.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2003)
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4
Outcomes of early language delay: II. Etiology of transient and persistent language difficulties.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2003)
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5
Genetic and environmental mediation of the relationship between language and nonverbal impairment in 4-year-old twins.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; Scopus (http://www.scopus.com/home.url) ; CrossRef (2003)
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6
Genetic and environmental mediation of the relationship between language and nonverbal impairment in 4-year-old twins
In: J SPEECH LANG HEAR R , 46 (6) 1271 - 1282. (2003) (2003)
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7
The structure of language abilities at 4 years: a twin study.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) (2002)
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8
Genetic and environmental origins of verbal and performance components of cognitive delay in 2-year-olds.
In: Symplectic Elements at Oxford ; Europe PubMed Central ; PubMed (http://www.ncbi.nlm.nih.gov/pubmed/) ; Web of Science (Lite) (http://apps.webofknowledge.com/summary.do) ; ORA review team (1999)
Abstract: The authors investigated the etiology of several measures of cognitive delay. Verbal (V) and performance (P) abilities were assessed in over 3,000 pairs of 2-year-old twins. Group-differences heritability for general delay (the lowest 5% of the V and P composite) was 35%. However, V and P delays considered independently showed large differences in group heritability (77% for V vs. 40% for P). Specific delays with comorbid cases eliminated showed an even greater difference in group heritability (78% vs. 22%, respectively). The small sample comorbid for both V and P delay also yielded high group heritability for both V (77%) and P (93%) scores. Shared environmental factors also differed in magnitude for V (20%) and P (41%) delays. Because the genetic and environmental origins of V and P delays in infancy differ, they are better considered separately rather than combined into a composite measure of general cognitive delay.
Keyword: Child; Diseases in Twins; Female; Genetic Predisposition to Disease; Humans; Individuality; Intelligence; Language Development Disorders; Male; Preschool; Psychomotor Disorders; Risk Factors; Social Environment; Vocabulary
URL: https://doi.org/10.1037//0012-1649.35.4.1122
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