Concurrent schedules: Spatial separation of response alternatives

Area of Science:

• Behavioral science
• Animal behavior
• Operant conditioning

Background:

• Pigeons are often used in behavioral studies to understand decision-making.
• Matching law describes response allocation in concurrent schedules of reinforcement.
• Procedural variables can influence deviations from the matching law.

Purpose of the Study:

• To investigate how manipulating a physical barrier between response options affects pigeons' choice behavior.
• To determine the impact of partition length on changeover rate and adherence to the matching law.
• To examine the effect of adding a limited hold to reinforcement schedules in conjunction with a partition.

Main Methods:

• Four pigeons were trained on concurrent variable-interval schedules (VI20, VI60).
• A transparent partition's length between response keys was systematically increased.
• Experiment 2 introduced a 4-second limited hold to the schedules.

Main Results:

• Increasing partition length decreased the rate of switching between schedules (changeover rate).
• Over-matching was observed at a partition length of 20 cm.
• In Experiment 2, increased partition length led to a greater decrease in changeover rate, promoting exclusive choice of the VI20 schedule.

Conclusions:

• Physical barriers (partitions) significantly alter choice behavior in pigeons under concurrent schedules.
• Deviation from matching predictions is influenced by procedural manipulations, such as partition length and limited hold.
• These findings highlight the role of environmental constraints in shaping response allocation and decision-making processes.