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New Procedures Applied to a Sample of Normal Monozygotic Twins

William G. Iacono, PhD; David T. Lykken, PhD

Arch Gen Psychiatry. 1979;36(12):1361-1369.

Abstract
• New methods for examining eye movements were developed and applied in a study of young, adult monozygotic twins. Subjects, tested twice, engaged in smooth pursuit tracking at different target frequencies, followed a stimulus requiring saccadic eye movements, performed a related psychomotor hand tracking task, and tracked a target while monitoring changes in the stimulus display. Analysis of test-retest reliability and twin concordance suggested that performance on these tasks characterized stable traits and were consistent with other reports implicating a genetic contribution to tracking ability. Special consideration was given to the probable role of attention in producing various types of tracking deficit. Estimates of the incidence of tracking dysfunction and correlations with psychometrically measured personality traits were examined.

Author Affiliations
From the Psychiatry Research Unit, Department of Psychiatry, University of Minnesota Medical School, Minneapolis.

Footnotes
Accepted for publication Nov 14, 1978.

Presented in part before the Society for Psychophysiological Research, Philadelphia, Oct 19, 1977.

Reprint requests to Psychiatry Research Unit, Box 392 Mayo, University of Minnesota, 420 Delaware St, Minneapolis, MN 55455 (Dr Iacono).

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