Titration of schedule parameters by pigeons

Area of Science:

• Behavioral psychology
• Animal cognition
• Operant conditioning

Background:

• Pigeons were studied in a computer-controlled environment to understand their decision-making processes.
• The experiment involved concurrent schedules of reinforcement, where pigeons chose between a standard and an adjusting schedule.

Purpose of the Study:

• To investigate how pigeons choose between different reinforcement schedules.
• To determine if pigeons' choices align with Herrnstein's quantitative law of effect under concurrent chain conditions.

Main Methods:

• Pigeons pecked keys in a two-key chamber presenting concurrent standard and adjusting schedules.
• The adjusting schedule's parameters changed based on the pigeon's key choice.
• Fixed intervals and fixed ratios were used as standard schedules, with adjusting intervals and ratios.

Main Results:

• When schedule types matched, median parameters on the adjusting key equaled those of the standard schedules.
• Indifference points, where choices were balanced, formed predictable curves across different schedule types (ratio-interval and interval-ratio).
• Individual differences in choice behavior were observed but could be predicted by equalizing reinforcement time.

Conclusions:

• Pigeons' choices between concurrent schedules are predictable and consistent.
• The findings support the application of Herrnstein's quantitative law of effect to concurrent chain schedules.
• The study suggests that pigeons aim to equalize the time to reinforcement across concurrently available options.