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LEVEL 2: hand morphology and psychotic behavior
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Research on the relationship between the hand morphology and psychotic behavior is very rare.
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LEVEL 3: the lines and psychotic behavior
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Three studies have presented evidence which shows a relationship between the palmar lines and psychotic behavior.
Again the simian crease appears to be a relevant factor.
In the study presented by Hilbun3 the hands of 3 out of 20 children (=15%) showed simian crease in both hands.
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The studies by van Os1 and Rosa2 indicate that the hands of psychotic people
are frequently featured with 'abnormal lines': see table C-8.
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Sources: - CONTENT: Psychosis & abnormal lines, broken skin ridges, simian crease, psychotic behavior, Hilbun, Rosa, van Os -
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1 - Van Os, J. et al. (1997). Dermatoglyphic findings on a group of psychotic children. The Journal of nervous and mental disease, 41, p.624-626.
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2 - Rosa, A. et al. (2000). Congenital dermatoglyphic malformations and psychosis: a twin study. American Journal of psychiatry, Sep; 157(9): p.1511-1513.
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3 - Hilbun, w.B. (1970). Dermatoglyphic findings on a group of psychotic children. The journal of nervous and mental disease, vol.151, no.5, p.352-358.