On some causes of behavioral contrast

Area of Science:

• Behavioral Psychology
• Operant Conditioning
• Animal Behavior

Background:

• Behavioral contrast is a phenomenon where changes in reinforcement in one condition affect responding in another.
• Differential reinforcement of low rates (DRL) schedules involve reinforcing infrequent responses.
• Understanding the factors influencing behavioral contrast is crucial for behavioral analysis.

Purpose of the Study:

• To investigate the relative contributions of response rates and reinforcement rates to behavioral contrast.
• To examine how visual stimuli, correlated with interresponse times, influence responding under a DRL schedule.
• To determine if increased reinforcement in one component leads to contrast in another, despite reduced overall reinforcement efficiency.

Main Methods:

• A multiple schedule with two components was used, employing differential reinforcement of low rates (DRL).
• Visual stimuli, signaling interresponse time duration, were introduced to one component.
• Response rates and reinforcement rates were systematically measured in both components.

Main Results:

• The introduction of visual stimuli decreased responding in the modified component, increasing reinforcement rate within that component.
• Despite the increased reinforcement in the modified component, responding increased in the unmodified component (behavioral contrast).
• This contrast occurred even though the increased responding in the unmodified component led to less frequent reinforcement.

Conclusions:

• Behavioral contrast can occur even when the change in reinforcement in one component leads to less efficient reinforcement overall.
• The manipulation of visual stimuli, affecting response rates, was sufficient to induce contrast.
• This study highlights the complex interplay between reinforcement schedules, stimulus control, and behavioral contrast.