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MMPI Scale 9 changes in incarcerated felons

B A Lucas, C S Newmark

    Psychological Reports
    |February 1, 1993
    PubMed
    Summary

    Scores on the Minnesota Multiphasic Personality Inventory (MMPI) Scale 9 significantly declined over time in incarcerated males, while Scale 4 remained stable. This suggests potential psychological shifts during incarceration, possibly linked to depression.

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    Area of Science:

    • Forensic Psychology
    • Clinical Psychology
    • Criminology

    Background:

    • The Minnesota Multiphasic Personality Inventory (MMPI) is a widely used psychological assessment tool.
    • Incarcerated male felons often exhibit elevated scores on MMPI clinical subscales 4 (Psychopathic Deviate) and 9 (Psychasthenia).
    • Understanding psychological changes in this population is crucial for effective correctional and rehabilitation strategies.

    Purpose of the Study:

    • To analyze changes in MMPI Scale 4 and Scale 9 scores among incarcerated male felons over time.
    • To investigate the long-term psychological impact of incarceration on this demographic.
    • To explore potential links between score changes and the development of depressive symptoms.

    Main Methods:

    • Longitudinal analysis of MMPI clinical subscale scores (Scale 4 and Scale 9).
    • Focus on a population of incarcerated male felons.
    • Statistical comparison of scores over different time points during incarceration.

    Main Results:

    • MMPI Scale 4 scores remained consistent throughout the study period.
    • MMPI Scale 9 scores demonstrated a significant decline over time.
    • The observed decline in Scale 9 suggests a potential reduction in certain psychological distress indicators.

    Conclusions:

    • Incarceration may lead to significant shifts in psychological profiles, specifically a decrease in traits measured by MMPI Scale 9.
    • The consistency of Scale 4 scores indicates enduring personality characteristics.
    • The decline in Scale 9 warrants further investigation into potential depression or adaptation to the prison environment.

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