Spatial working memory as an endophenotype for schizophrenia

David C. Glahn, Sebastian Therman, Marko Manninen, Matti Huttunen, Joakko Kaprio, Jouko Lönnqvist, Tyrone D. Cannon

Research output: Contribution to journalArticle

215 Scopus citations

Abstract

Background: Spatial working memory impairments are among the neurocognitive deficits that may mark genetic predisposition toward schizophrenia. We previously reported that impairment on the spatial span subtask of the Wechsler Adult Intelligence Scale - Revised increased in a dose-dependent manner with increasing genetic predisposition toward schizophrenia in a sample of discordant twins; however, it remains to be determined whether these deficits reflect difficulties with encoding, maintenance, manipulation, time-tagging of visual spatial information, storage capacity, or complex motor response. Methods: We developed a spatial delayed response task in which memory set size was parametrically varied, holding constant manipulation and decision processes. We then reassessed 80 of the previously studied twins (17 probands with 8 monozygotic co-twins and 13 dizygotic co-twins, and 42 healthy twins). Results: The spatial delayed response task was sensitive to genetic loading for schizophrenia but did not provide evidence for capacity limitations in probands or their co-twins. Conclusions: The findings suggest that deficits in the encoding or storage aspects of short-term spatial mnemonic processing may be an effective endophenotypic marker for schizophrenia.

Original languageEnglish (US)
Pages (from-to)624-626
Number of pages3
JournalBiological Psychiatry
Volume53
Issue number7
DOIs
StatePublished - Apr 1 2003

Keywords

  • Behavioral genetics
  • Endophenotype
  • Neuropsychology
  • Schizophrenia
  • Spatial working memory
  • Twins

ASJC Scopus subject areas

  • Biological Psychiatry

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  • Cite this

    Glahn, D. C., Therman, S., Manninen, M., Huttunen, M., Kaprio, J., Lönnqvist, J., & Cannon, T. D. (2003). Spatial working memory as an endophenotype for schizophrenia. Biological Psychiatry, 53(7), 624-626. https://doi.org/10.1016/S0006-3223(02)01641-4