Genetic influence on the variance in coincidence timing and its covariance with IQ: A twin study

Wright, Margaret J., Smith, Glen A., Geffen, Gina M., Geffen, Laurie B. and Martin, Nicholas G. (2000) Genetic influence on the variance in coincidence timing and its covariance with IQ: A twin study. Intelligence, 28 4: 239-250. doi:10.1016/S0160-2896(99)00036-7

Author Wright, Margaret J.
Smith, Glen A.
Geffen, Gina M.
Geffen, Laurie B.
Martin, Nicholas G.
Title Genetic influence on the variance in coincidence timing and its covariance with IQ: A twin study
Journal name Intelligence   Check publisher's open access policy
ISSN 0160-2896
Publication date 2000-01-01
Sub-type Article (original research)
DOI 10.1016/S0160-2896(99)00036-7
Volume 28
Issue 4
Start page 239
End page 250
Total pages 12
Place of publication Oxford, U.K.
Publisher Elsevier
Language eng
Subject C1
380399 Cognitive Science not elsewhere classified
780108 Behavioural and cognitive sciences
Formatted abstract
Performance measures on a coincidence timing task have previously been associated with psychometric IQ suggesting that the ability of an individual to devote processing resources at the required time may account for some of intelligence test variance. Using the twin design, this study investigates whether genetic variability explains some of the variance in coincidence timing and whether common genetic factors account for the association with intellectual functioning. Fifty-five 16-year old twin pairs (28 MZ, 27 DZ) were tested. Individual differences in number of hits (HITS), mean absolute error (MAE), and intra-individual trial-to-trial consistency (SD) were significantly influenced by genetic factors, accounting for approximately 50 percent of the variance. The correlation between coincidence timing and psychometric IQ was confirmed and ranged from 0.11 to 0.53 with a mean correlation of 0.33. In the limited sample, the correlation between IQ and the coincidence timing measures appeared to be mediated largely by a unique environmental factor, with only a small loading of SD on the genetic factor influencing IQ. However, as the confidence intervals in the other genetic cross loadings are large, we cannot exclude the possibility of a much stronger genetic influence.
Keyword Psychology, Multidisciplinary
Elementary cognitive tasks
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes Publication date: Winter 2000.

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Psychology Publications
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Created: Tue, 10 Jun 2008, 23:16:37 EST