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  • Time-based but not event-based prospective memory remains impaired one year after the onset of schizophrenia: A prospective study

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    Author(s)
    Cheung, Eric FC
    Lui, Simon SY
    Wang, Ya
    Yang, Tian-xiao
    Shum, David HK
    Chan, Raymond CK
    Griffith University Author(s)
    Shum, David
    Chan, Raymond
    Year published
    2015
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    Abstract
    Background: Prospective memory (PM) deficits have been consistently found in people with schizophrenia. Although there is evidence to suggest that PM deficits may be putative markers for schizophrenia, no longitudinal study has investigated the persistence of PM deficits. Aims: We examined whether PM deficits persist after the onset of schizophrenia, and compared the trajectories of time- and event-based PM performance 12 months after illness onset. We also examined whether the association between PM and clinical symptoms changes over time 12 months after illness onset. Method: We recruited 58 individuals with first-episode ...
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    Background: Prospective memory (PM) deficits have been consistently found in people with schizophrenia. Although there is evidence to suggest that PM deficits may be putative markers for schizophrenia, no longitudinal study has investigated the persistence of PM deficits. Aims: We examined whether PM deficits persist after the onset of schizophrenia, and compared the trajectories of time- and event-based PM performance 12 months after illness onset. We also examined whether the association between PM and clinical symptoms changes over time 12 months after illness onset. Method: We recruited 58 individuals with first-episode schizophrenia for a 12-month follow-up study. Comparison participants were 37 healthy individuals who were matched in terms of demographics and intelligence with the patient group. PM functions and clinical symptoms were measured at baseline, the sixth month, and the twelfth month, using a computerized PM task and the Positive and Negative Syndrome Scale. Results: People with schizophrenia showed a gradual improvement in both time- and event-based PM 12 months after illness onset. However, compared to event-based PM, deficit in time-based PM persisted and was relatively stable. At baseline, PM functions were not associated with clinical symptoms. However, an association between time-based PM and PANSS positive and general symptoms emerged 12 months after the onset of schizophrenia. Conclusion: People with first-episode schizophrenia exhibit persistent time-based PM deficit. Our findings support that PM deficit, in particular, time-based deficit, may be a putative neuropsychological marker of schizophrenia.
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    Journal Title
    Schizophrenia Research
    Volume
    169
    Issue
    1-3
    DOI
    https://doi.org/10.1016/j.schres.2015.09.015
    Copyright Statement
    © 2015 Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (http://creativecommons.org/licenses/by-nc-nd/4.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, providing that the work is properly cited.
    Subject
    Biomedical and clinical sciences
    Psychology
    Other psychology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/101573
    Collection
    • Journal articles

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