Second-order schedules with fixed-ratio components: variation of component size

Area of Science:

• Behavioral Psychology
• Animal Behavior
• Operant Conditioning

Background:

• Second-order schedules of reinforcement involve a stimulus signaling the availability of primary reinforcement.
• Fixed-ratio (FR) schedules require a specific number of responses for reinforcement.
• Understanding response patterns under complex schedules is crucial for behavioral analysis.

Purpose of the Study:

• To investigate the effect of varying fixed-ratio component sizes within a second-order schedule on pigeon key pecking.
• To determine how component size influences overall response rate and within-unit responding patterns.
• To compare findings with established principles of simple fixed-ratio schedules.

Main Methods:

• Pigeons' key pecking behavior was studied using second-order schedules with food reinforcement.
• The total response requirement (256 pecks) was divided into varying fixed-ratio components (128, 64, 32, 8, 2).
• A brief stimulus preceded food delivery upon completion of each component.

Main Results:

• Within-unit responding patterns generally resembled those under simple fixed-ratio schedules.
• Overall response rate exhibited an inverted U-shaped function relative to component size.
• Highest response rates were observed with moderate component sizes (FR 128 and FR 64).

Conclusions:

• Component size in second-order schedules significantly impacts overall response rates in pigeons.
• The observed inverted U-shaped relationship suggests an optimal range for component size to maximize responding.
• Findings are consistent with rate-dependency principles observed in simple fixed-ratio schedules.