Effects of alternative reinforcement: does the source matter?

Area of Science:

• Behavioral psychology
• Animal behavior studies

Background:

• Pigeon key-pecking behavior is a model for understanding reinforcement schedules.
• Previous research suggests reinforcement rate influences response rate.

Purpose of the Study:

• To investigate how pigeons adjust their key-pecking rates when offered additional food reinforcements.
• To determine if signaling or required pauses affect this adjustment.
• To test the predictive power of Herrnstein's matching law.

Main Methods:

• Pigeons pecked a key under a variable-interval schedule for food reinforcement.
• Concurrent independent schedules provided extra food reinforcements.
• Conditions varied in signaling (key color), required pauses (2-sec), and reinforcement rate/duration.

Main Results:

• Pecking rate decreased as the amount of extra reinforcement per unit time increased, following a consistent inverse function.
• This relationship held true regardless of whether extra reinforcements were signaled, unsignaled with a pause, or unsignaled freely.
• The observed function matched predictions from Herrnstein's matching law.

Conclusions:

• Pigeon's response rate is inversely related to the rate of overall reinforcement.
• The mechanism of reinforcement delivery (signaled, unsignaled, pause required) did not alter this fundamental relationship.
• Herrnstein's matching law accurately predicts behavioral adjustments to reinforcement availability in pigeons.