Descriptor
| Cognitive Ability | 1 |
| Cognitive Development | 1 |
| Developmental Delays | 1 |
| Etiology | 1 |
| Mental Retardation | 1 |
| Nature Nurture Controversy | 1 |
| Toddlers | 1 |
| Twins | 1 |
Source
| Developmental Psychology | 1 |
Author
| Eley, Thalia C. | 1 |
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| Journal Articles | 1 |
| Reports - Research | 1 |
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Peer reviewedEley, Thalia C.; And Others – Developmental Psychology, 1999
Investigated the etiology of several measures of cognitive delay in over 3,000 pairs of 2-year-old twins, focusing on group-differences heritability for general and specific cognitive delays. Concluded that because the genetic and environmental origins of verbal and performance delays in infancy differ, they are better considered separately rather…
Descriptors: Cognitive Ability, Cognitive Development, Developmental Delays, Etiology
