Time estimation and time production in depressive patients

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Abstract
Depressive inpatients (23) and matched controls were studied 3 times at 2-wk intervals. Both patients and controls initially overestimated, and subsequently approximated to, the short time spans (5-240 s) while both correctly estimated the long ones (15 and 30 min) over the 3 occasions (Time Estimation Test, TET). There were no differences in the TET scores among the patients themselves, or between the patients and controls with the exception of 1 time span which the patients overestimated more than the controls. Among the depressive symptoms, only retardation was correlated with the TET scores. Similarly in the production of 30 s (Time Production Test, TPT) there were no differences among the patients or between patients and controls. Only retardation was negatively correlated with the TPT score. Since the TET scores of the short time spans were negatively correlated with the TPT scores, it was speculated that both results derived from a single faculty, which was clinically manifested as retardation.

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