WAIS-R features of preclinical Huntington's Disease: Implications for early detection

Tarja-Brita Robins Wahlin, Maria Larsson, Mary Luszcz, Gerard Byrne

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)

    Abstract

    Background/Aims: The main purpose of the study was to determine whether the predicted age of onset of Huntington's disease (HD) affects cognitive function as measured by the Wechsler Adult Intelligence Scale-Revised (WAIS-R). The subscales and subtests, and their potential selectivity were examined in preclinical HD (30 mutation carriers and 34 noncarriers) with no motor or neuropsychiatric signs of HD. Methods: The predicted age of onset in mutation carriers was calculated by a regression equation allowing this group to be divided according to whether onset was predicted as within 12 years (HD+CLOSE) or longer than this (HD+DISTANT). Results: The HD+CLOSE group scored significantly lower on Verbal, Performance, and Full Scale IQ compared to noncarriers and performed significantly lower on 7 of the 11 WAIS-R subtests, with low average scores in language abilities, attention, abstract thinking, problem solving, visuospatial ability, and psychomotor speed. Conclusion: These low average scores affect general intelligence and functioning of HD+CLOSE carriers and are likely to reflect dysfunction of frontal cortex and frontostriatal circuits more than a decade before manifest symptoms. Our findings support a continuous linear model of slow cognitive decline in HD.

    Original languageEnglish
    Pages (from-to)342-350
    Number of pages9
    JournalDementia and Geriatric Cognitive Disorders
    Volume29
    Issue number4
    DOIs
    Publication statusPublished - 1 May 2010

    Keywords

    • Cognition
    • Executive functions
    • Huntington's disease
    • Intelligence
    • IQ
    • Neuropsychology
    • Preclinical
    • Wechsler Adult Intelligence Scale

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