Arch Gen Psychiatry. 1980 Jun;37(6):627-31.

Deviant eye tracking in twins discordant for psychosis. A replication.

Holzman PS, Kringlen E, Levy DL, Haberman SJ.

Abstract

An earlier study of smooth-pursuit eye movements (SPEMs) in monozygotic (MZ) and dizygotic (DZ) twins discordant for functional psychosis reported high concordance of pursuit abnormalities in MZ pairs and moderate concordance in DZ pairs. That study was repeated with younger pairs of twins and with some quantitative refinements in scoring. Results show the same levels of concordance for pursuit dysfunctions, thus replicating the earlier study. The data support an interpretation of genetic factors contributing to variability in SPEMs.

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Abnormal-pursuit eye movements in schizophrenia. Evidence for a genetic indicator. [Arch Gen Psychiatry. 1977]
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Holzman PS, Kringlen E, Levy DL, Proctor LR, Haberman SJ, Yasillo NJ. Arch Gen Psychiatry. 1977 Jul; 34(7):802-5.
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Cited by 1 PubMed Central article

SPEM dysfunction and general schizotypy as measured by the SSQ: a controlled study. [BMC Neurol. 2009]
SPEM dysfunction and general schizotypy as measured by the SSQ: a controlled study.
van Kampen D, Deijen JB. BMC Neurol. 2009 Jun 29; 9:27. Epub 2009 Jun 29.

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