Primal Health Databank: Study
| Entry No: | 0235 |
| Title: | Origins and implications of handedness and relative birth weight for IQ in monozygotic twin pairs |
| Author(s): | Segal NL |
| Reference: | Neuropsychologia 1989; 27(4): 549-61 |
| Place of Study: | USA |
| Abstract: | The results of this study support the hypothesis that left handedness in lower birth weight identical twins may be associated with pre-natal pathological events, while left-handedness in higher birth weight left handed identical twins may be associated with delayed zygotic splitting and disrupted asymmetry determination. Birth weight status within identical twins may predict a lower IQ for the lower birth weight twin only when lower birth weight co-occurs with left handedness. Prenatal insult similarly reduced verbal IQ, but not performance IQ, within these particular pairs. |
| Keyword(s): | birth weight, handedness, intellectual development, IQ, twins |
| Discussion: | The authors did not compare first born twins and second born twins. The birth of a second twin is often more difficult. This would be a way to evaluate the importance of perinatal factors. |
| See Also: | No related entries mentioned for this entry |
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