Abstract
The performance of forty chicks in a straight runway to heat reinforcement was measured under four drive conditions across 20 trials in a 2 by 2 by 20 factorial design. The two main treatment conditions were level of ambient temperature and length of time in the cold start box before a trial began. Heat was a potent reinforcement for newly hatched chicks as demonstrated by significant increases in starting, alley, and total speed scores across trials. Manipulations in drive level also significantly affected both the rate of acquisition and the asymptotic level of performance.
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