Differential effects of early hemisphere damage on lexical comprehension and production

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Abstract
The effects of early hemisphere damage on lexical development were investigated in 33 children with unilateral left (n = 21) or right (n = 12) hemisphere damage and 16 normal healthy controls. Single-word naming was assessed using the Expressive One-Word Picture Vocabulary Test (EOW) and lexical comprehension was assessed using the Peabody Picture Vocabulary Test-Revised (PPVT-R). Left lesion subjects (LL) performed comparable to controls in naming, but scored lower than controls on the PPVT-R. Right lesion subjects (RL) scored lower than controls and LL subjects on both the EOW and the PPVT-R. The unexpected superiority of LL in comparison to RL children on the EOW and the PPVT-R argues against a simple left hemisphere dominance for early lexical development. RL subjects' significant comprehension deficits failed to correlate with more general measures of verbal intelligence, supporting a specialized role of the right hemisphere in mediating the acquisition of word meaning.