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Journal of Pediatric Psychology 9(4) pp. 485-494, 1984
© 1984 Society of Pediatric Psychology

research-article

Cognitive and Personality Differences Between Identical Twins Following Skull Fractures

Michael J. Lyons1 and Adam P. Matheny

The University of North Carolina at Charlotte, University of Louisville School of Medicine

1All correspondence should be sent to Michael J. Lyons, who is now at the Psychology Department, Merrimack College, North Andover, MA 01845.

The classical co-twin control method was used to evaluate the effects of age at the time of skull fracture on behavioral functioning several years later. The sample consisted of 13 pairs of male monozygotic twins. In each pair, one twin had suffered a noncompound skull fracture during one of the following two periods: between 12 and 36 months of age (five pairs) or between 36 and 48 months (eight pairs). All twins were given the Wechsler Preschool and Primary Scale of Intelligence (WPPSI) at 6 years of age and their mothers rated the twins on a personality/temperament scale. When compared with their co-twins, the twins injured between 12 and 36 months had no cognitive deficits, but had higher scores on a factor denoting ratings of emotionality. The twins injured between 36 and 48 months, when compared with their co-twins, had significantly lower scores on four performance subtests of the WPPSI, but did not differ in ratings of personality/temperament.

Key words: neuropsychology; skull fracture; identical twins; pediatric head injury.


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