75 adults were asked to estimate the correct time of day without reference to clocks at each of 6 times of day from 8:00 A.M. to 8:00 P.M. Significant group mean differences were found, with underestimation of correct time at mid-day and overestimation at early (8:00–10:00 A.M.) and later (6:00–8:00 P.M.) times of day.
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