THC Tolerance Restored Food-Key Responding but Not Attack Behavior in Pigeons
In a 1980 pigeon experiment, repeated THC allowed food-maintained key pecking to recover while attack behavior stayed strongly suppressed. Tolerance depended on which behavior was measured, even within the same animals and sessions.
Both behaviors were measured under a schedule
Food presentation maintained key pecking under a response-initiated fixed-interval schedule, which also generated schedule-induced aggression. Initial THC administration reduced both key-pecking and attack rates. These were specific laboratory behaviors rather than broad assessments of motivation or personality.
The repeated-exposure patterns diverged
Across sessions, key-pecking returned to predrug rates, consistent with tolerance to that suppressive effect. Attack responding remained suppressed through the injection series. Recovery of the food-reinforced response therefore did not establish disappearance of all behavioral effects.
A pigeon aggression model is not a human violence outcome
Schedule-induced attack reflects the conditions of the experimental task. It does not directly show that cannabis reduces interpersonal violence, treats aggression or changes real-world social behavior. The study also does not isolate whether receptor adaptation, learning or another process explains the selective recovery.
The experiment contributes a clear within-protocol contrast between two behaviors. It supports naming the exact function when claiming tolerance or recovery. An intact practiced response can coexist with a persistent drug effect elsewhere, without supplying an individual human impairment determination.
Related: interpreting cannabis tolerance claims.
Research cited
Cherek DR; Thompson T; Kelly T. Chronic delta 9-tetrahydrocannabinol administration and schedule-induced aggression. Pharmacology, biochemistry, and behavior (1980). doi:10.1016/0091-3057(80)90374-3. Findings discussed from the study abstract.
