Speed-accuracy trade-off and time of day |
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| Authors: | A Craig R Condon |
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| Affiliation: | 1. Department of Psychology, University of New Orleans, Louisiana, USA;2. Department of Human Development and Family Studies, University of Alabama, Tuscaloosa, AL, USA;1. Students'' Scientific Society, Department of Anaesthesiology and Intensive Care, School of Medicine in Katowice, Medical University of Silesia, 14 Medykow Street, 40752 Katowice, Poland;2. Department of Environmental Medicine and Epidemiology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, 18 Jordana Street, 41808 Zabrze, Poland;1. MOVE Research Institute Amsterdam, Department of Human Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands;2. CORAL – Centre for Orthopaedic Research Alkmaar, Orthopaedic Outpatient Department, Medical Centre Alkmaar, Alkmaar, The Netherlands;3. Department of Rehabilitation Sciences, Faculty of Kinesiology and Rehabilitation Sciences, KU Leuven, Leuven, Belgium |
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| Abstract: | Data were collected at six times of day from a total of 48 subjects working at a self-paced version of a visual, signal identification task. Speed of inspection and confidence of report both tended to increase over the day, while signal detectability (d′) declined. The response criterion (ln β) remained invariant with time of day. To determine whether variations in speed were being offset by those in accuracy, the efficiency indices d′/T and d′/√T were derived. Analyses showed that efficiency was stable over test times: 8:00, 11:00, 17:00, 20:00, indicating the operation of a speed-accuracy trade-off; but efficiency dropped significantly at 14:00 (possibly a post-lunch dip) and again at 23:00, at the end of the day. The shift in the trading relation between speed and accuracy was in the direction of faster but less careful performance as the day progressed; the possibility that this is due to accumulated fatigue rather than to time of day per se, is discussed. |
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