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Immobility as an avoidance response, and its disruption by drugs.

D BINDRA, H ANCHEL

Journal of the Experimental Analysis of Behavior

|April 1, 1963

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Animals can learn to remain motionless to avoid electric shock. This immobility avoidance behavior is influenced by shock intensity and drug treatments, offering new insights into avoidance learning.

Area of Science:

Behavioral Neuroscience
Animal Behavior
Pharmacology

Background:

Existing research on avoidance behavior primarily focuses on active responses like running or lever-pressing.
The capacity for passive avoidance learning, specifically immobility, has been less explored.

Purpose of the Study:

To investigate if animals can learn an immobility response to escape or avoid electric shock.
To examine factors influencing the acquisition of immobility avoidance.
To assess the effects of psychotropic drugs on this learned immobility behavior.

Main Methods:

Experiment I: Trained rats in an escape-avoidance paradigm requiring immobility; control rats received yoked shocks.
Experiment II: Assessed acquisition of immobility avoidance at varying shock intensities, controlling for escape behaviors.

Keywords:

AVOIDANCE LEARNING CHLORPROMAZINE IMIPRAMINE LOCOMOTION METHYLPHENIDATE

Related Experiment Videos

Experiment III: Administered methylphenidate, chlorpromazine, and imipramine to rats exhibiting immobility avoidance and analyzed behavioral changes.

Main Results:

Rats successfully learned an immobility avoidance response, distinct from unconditioned freezing.
Immobility avoidance was acquired more readily at higher shock intensities when escape was prevented.
Methylphenidate, chlorpromazine, and imipramine differentially impaired the immobility avoidance response.

Conclusions:

Learned immobility is a viable avoidance strategy in rodents.
Shock intensity significantly impacts the learning of immobility avoidance.
Pharmacological agents have distinct effects on immobility avoidance, suggesting differential mechanisms of action relevant to drug screening and avoidance behavior theories.