Abstract
A sea lion (Zalophus californianus) was trained to report the presence of a pure tone in a yes‐no psychophysical procedure. Reinforcement schedules were varied by changing the probability of fish reinforcement [P(SR)] contingent on two classes of response—hits and correct rejections. The P(SR|Hit) and the P(SR|CR) were 1.00, 0.75, 0.50, and 0.25. In baseline, both P(SR|CR) were 1.00. In each of the other schedules, P(SR) was held constant at unity for one response and varied for the other response. Thus seven different reinforcement schedules were used. The sea lion showed rapid acquisition of a stable response bias as a function of systematic variation of reinforcement schedules. These results demonstrate that varying reinforcement schedules is as effective as varying the payoff matrix in the control of response bias in underwater signal detection experiments with sea lions [see H.J. Schusterman. B. Barrett, and P. Moore, J. Acoust. Soc. Am. 57, 1526–1532 (1975)]. [Work supported by ONR.]
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