Concurrent avoidance of shocks by pigeons pecking a key

Area of Science:

• Behavioral Psychology
• Animal Cognition
• Operant Conditioning

Background:

• Avoidance behavior is crucial for survival, involving learning to prevent aversive stimuli.
• Concurrent schedules of reinforcement allow for the study of choice and competing responses.
• Understanding how animals learn under unsignaled avoidance conditions provides insight into complex decision-making.

Purpose of the Study:

• To investigate pigeon behavior under concurrent, unsignaled avoidance schedules.
• To examine the effect of varied response-shock intervals on keypress rates.
• To determine if pigeons adjust responding based on predictable versus unpredictable shock consequences.

Main Methods:

• Three pigeons were trained on a two-key concurrent avoidance procedure.
• A constant response-shock interval (22 seconds) was maintained on one key.
• The response-shock interval on the other key was systematically varied (7-52 seconds).

Main Results:

• Pigeons decreased response rates on the key with the varied response-shock interval as it increased.
• Responding on the key with the constant 22-second interval remained largely unaffected.
• This suggests pigeons discriminated between schedules based on the predictability of shock avoidance.

Conclusions:

• Pigeons demonstrate adaptive learning by reducing responses when the probability of shock avoidance decreases.
• Behavior under concurrent avoidance schedules is sensitive to variations in the temporal relationship between response and consequence.
• These findings contribute to understanding the mechanisms of learned avoidance and choice behavior.