Equally divided by sex and distributed equally across fourth/fifth, eighth/ninth, and college grade levels, 144 subjects performed a mental rotation task under instructions emphasizing either accuracy or speed of response, or both. Instructions had large and consistent effects on speed of response but were not as uniformly effective in their…

In two experiments, 168 subjects aged 8-22 years performed visual search and memory search tasks (experiment 1) or memory search, mental rotation, analogical reasoning, and mental addition tasks (experiment 2). Increases with age in speeds of visual and memory search were described well by exponential functions. (SKC)

Discusses research on children's speed in identifying digits and letters in continuous lists and discrete trials. Latency for word identification and digit naming varied considerably. Naming speed contributed variance in reading skill independently of measures of phonological awareness. (Author/GH)

Examines interactions between timing accuracy and muscular parameters in children aged five who performed a visuomotor game. Five images were successively presented on a television display at precisely timed intervals for a total period of 11 seconds. Results suggest that timing accuracy is dependent on action-produced sensory cues. (RWB)