Abstract
"Reach-work", the scaled distance an animal reached to obtain a food incentive, and "weight-work", the scaled weight added to the tray which the animal pulled to obtain the food, were systematically varied to study their effect on errors, balks and latencies of response. Errors varied in a complex manner as a function of work,intermediate work values producing optimum performance when performance was at a high level. Balks and latencies were related to work in a simple accelerated function. 20 references.
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