The Genetic and Environmental Origins of Language Disability and Ability
Article first published online: 23 MAR 2004
Volume 75, Issue 2, pages 445–454, March 2004
How to Cite
Spinath, F. M., Price, T. S., Dale, P. S. and Plomin, R. (2004), The Genetic and Environmental Origins of Language Disability and Ability. Child Development, 75: 445–454. doi: 10.1111/j.1467-8624.2004.00685.x
- Issue published online: 23 MAR 2004
- Article first published online: 23 MAR 2004
This study investigated whether genes affect language impairment to the same extent as they affect differences in language ability following up an earlier study of 579 four-year-old twins with low language performance and their cotwins (Viding et al., in press). The present study selected low-language twins from 6,963 pairs of twins from the Twins Early Development Study assessed for vocabulary and grammar by their parents at 2, 3, and 4 years of age. For impaired groups corresponding to the lowest scoring 5% and 10% at each age, twin concordances and model-fitting analyses indicated substantial genetic influence on the mean difference between affected children and the population (h2g), generally higher than for individual differences for the entire sample (h2).