Unit price and choice in a token-reinforcement context

Area of Science:

• Behavioral psychology
• Animal behavior
• Operant conditioning

Background:

• Understanding choice behavior is crucial in behavioral economics and psychology.
• Token reinforcement schedules help model complex decision-making processes in animals.

Purpose of the Study:

• To investigate pigeon preferences between concurrent second-order schedules of token reinforcement.
• To examine how unit price and ratio size influence choice behavior.
• To evaluate a unit-price model incorporating handling and reinforcer immediacy costs.

Main Methods:

• Pigeons were exposed to multiple and concurrent second-order schedules with stimulus lights as token reinforcers.
• Tokens were exchanged for food under fixed-ratio schedules with equal and unequal unit prices.
• Response rates and preference data were recorded under varying ratio sizes and unit prices.

Main Results:

• Pigeons showed a strong preference for lower unit prices when they were unequal.
• When unit prices were equal, preferences depended on ratio size, favoring smaller ratios.
• Response rates aligned with preference data, indicating sensitivity to ratio size and delay.

Conclusions:

• Choice behavior in pigeons is significantly influenced by the unit price of reinforcers.
• Delay to the exchange period (reinforcer immediacy) was a primary determinant of preference.
• A unit-price model, including additional costs, can effectively explain observed choice patterns.