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accuracy action activation theory activity alternatives appears arousal auditory Broadbent central Chapter complex correct Crossman decision degrees of choice delayed auditory feedback difficult digits discrimination display Ergonomics errors evidence example experiments extent fatigue effects feedback Figure Fitts foreperiod frequency function further given Hick's Hick's Law imply increase indicated intervals Kaswan knowledge of results learning less long-term memory material mean mechanism memory span movement msec muscles myoneural junctions noise oa oa oa observed obtained occur pairs pattern perception performance pointer position possible presented Psychol Quart random reaction reaction-time recall recoding refractory period response seems sensory serial short-term memory short-term retention shown in Fig signal signal-detection similar Skills speed stimulus studies subjects substantial suggested taken target task tend theory tion tracking trials vigilance visual Welford words