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The Wechsler Adult Intelligence Scale was administered serially to 40 severely head-injured adults, and the results compared with a matched group of 40 non-injured men. The scores on the verbal subtests showed less initial impairment and were faster to recover to the level of the comparison group than were the non-verbal subtest scores. Verbal IQ of the head-injury group approached that of the comparison group within about one year of injury, while recovery of Performance IQ continued over about three years.
Mandleberg et al. (Sat,) studied this question.
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