Rates and patterns of responding with concurrent fixed-interval and variable-interval reinforcement.

Area of Science:

• Behavioral psychology and animal cognition.

Background:

• Investigating how different reinforcement schedules influence animal behavior is crucial for understanding learning principles.
• Concurrent schedules of reinforcement present complex choice scenarios for subjects.

Purpose of the Study:

• To examine pigeon behavior under concurrent fixed-interval (FI) and variable-interval (VI) schedules of food reinforcement.
• To determine how the relative frequency of reinforcement affects response allocation between schedules.

Main Methods:

• Pigeons were trained on two keys, each associated with a concurrent FI and VI schedule.
• Systematic variation of reinforcement timing allowed for analysis of response patterns.

Main Results:

• The relative frequency of responding on the FI key was influenced by, but did not equal, the relative reinforcement frequency.
• Response ratios followed a power function of reinforcement ratios (exponent 0.5).
• FI response patterns were sensitive to both relative and absolute schedule values.

Conclusions:

• Pigeon's choice behavior under concurrent schedules is quantitatively predictable by a power function of reinforcement ratios.
• Reinforcement schedule values (both relative and absolute) impact response patterns and allocation in complex ways.