Conditioned suppression of counting behavior in rats.

Area of Science:

• Behavioral neuroscience
• Animal behavior studies
• Operant conditioning

Background:

• Complex operant behavior chains are essential for understanding decision-making under threat.
• Investigating how aversive stimuli impact sequential response patterns is crucial for applied psychology.

Purpose of the Study:

• To examine the impact of an aversive stimulus on a complex operant schedule requiring sequential lever responses.
• To determine if an unavoidable shock disrupts the maintenance of response chains necessary for reinforcement.

Main Methods:

• Three rats were trained on a sequential schedule of reinforcement (lever A responses followed by lever B).
• A stimulus predicting an unavoidable shock was introduced during the response chain.
• Response patterns on both levers, particularly the number of consecutive lever A responses, were analyzed before and during the shock stimulus.

Main Results:

• The schedule successfully established high rates of lever A responding and spaced lever B responding.
• The pre-shock stimulus significantly suppressed responding on both levers.
• During the shock stimulus, lever A response runs were shorter and fell below the reinforcement requirement.

Conclusions:

• Aversive stimuli, like unavoidable shock, disrupt complex operant behavior chains.
• The suppression effect extends to the preparatory responses (lever A), hindering the completion of the sequence for reinforcement.
• This suggests that fear and anxiety associated with aversive events can impair goal-directed sequential behavior.