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Conditioned suppression of free-operant avoidance.
Journal of the Experimental Analysis of Behavior
|March 1, 1972
Summary
Rats on an avoidance schedule showed suppressed responding during a light stimulus paired with shock. This suppression developed over time, indicating conditioned fear learning in rats.
Area of Science:
- Behavioral neuroscience
- Animal learning and behavior
Background:
- Operant conditioning principles govern animal behavior.
- Conditioned suppression is a key paradigm in studying fear conditioning.
Purpose of the Study:
- To investigate conditioned suppression in rats using a free-operant avoidance schedule.
- To examine the effect of a light stimulus preceding response-independent shock.
Main Methods:
- White rats were trained on an unsignalled free-operant avoidance schedule.
- A blinking white light (1 or 3 min) was followed by response-independent electric shock (7.5 mA).
- Avoidable shock was set at 1.5 mA.
Main Results:
- Suppression of responding during the light stimulus was observed and developed over sessions.
- Responding immediately after the light-shock sequence was not affected.
- Findings align with established 'positive conditioned suppression' effects.
Conclusions:
- A light stimulus paired with shock effectively elicits conditioned suppression in rats.
- The results support the role of associative learning in fear responses.
- This study contributes to understanding the mechanisms of conditioned fear.