Abstract
Abstract The relationship between corresponding latencies of old and young adults early in practice are examined across a range of tasks (choice reaction time, memory scanning and classification) in a within-subjects design. These relations are well described by linear functions in the case of cognitive processing times (CTs) on all tasks, movement times (MTs) from choice reaction and viewing times (VTs) from memory scanning. This linearity holds not only for comparisons of medians but also for other points of the within-subject distribution (WSD), specifically the 10th, 25th, 50th, 75th and 90th percentiles. The data for MTs lie above the CT points, suggesting relatively greater slowing of movement than of cognition in the aged. Slopes for VTs decrease with set size, indicating less compensation for increased memory load by (he aged. Most importantly, one linear equation describes 97% of the relationship between old and young people's CTs across all tasks and percentiles. This strongly suggests that the ...
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