Reinforcer-ratio variation and its effects on rate of adaptation

Article Abstract:

Individual reinforcers at the local level have shown predictable quantitative effects on experiments in response, while same-alternative reinforcers had rapidly diminishing effects. Reinforcers for an opposite alternative always significantly affected preference, and those changes increased when prior reinforcer ratios were greater.

Australia, Statistical Data Included

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Closed-economy multiple-schedule performance: effects of deprivation and session duration

Article Abstract:

An experiment studied how pigeons responded to food reinforcement on multiple variable-interval schedules where the total food consumption was fully dictated by the pigeons' interaction with the schedules. Results found evidence of overmatching, as seen in more extreme response allocation between components than the distribution of reinforcers. There was a drop in generalized-matching sensitivity from overmatching to undermatching values in traditional multiple schedules when food deprivation was raised by cutting session duration. Sensitivity likewise increased from undermatching to overmatching when the session became longer.

Animal feeding and feeds

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Nonstable concurrent choice in pigeons

Article Abstract:

Variable-interval reinforcement training experiments on six pigeons using a 31-step pseudorandom binary sequence found that total performance is directly related to the reinforcement ratio of a current session and partially affected by the reinforcement in a previous session. Initial application of the random sequence resulted in lower sensitivity to current-session reinforcement but did not affect overall sensitivity. Reinforcement ratios had no effect on either overall sensitivity to reinforcement or current-session sensitivity.

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