Frequency of attack in shock-elicited aggression as a function of the performance of individual rats.

Researchers paired rats in a cage and gave them brief electric shocks. They watched how often each rat attacked its partner.

Some rats were natural fighters. Others rarely fought. The team also gave either animal a calming drug called chlorpromazine to see if that changed the fight rate.

High-attack rats bit less when their partner was a low-attack rat. The same thing happened when either rat got more chlorpromazine.

Aggression dropped in both cases. The drug worked, but so did pairing a bully with a calm opponent.

Winett et al. (1972) later showed that rats with a history of winning fights or learning to avoid shock fought even more when shocked. The 1969 drug effect still holds, but past experience can override it.

Azrin et al. (1967) proved that pigeon attacks can be shaped by food on a fixed-interval schedule. Both papers show aggression is not just reflexive; it follows environmental rules.

Schneider et al. (1967) found that shock paired with food can either raise or lower lever pressing. Their mixed result lines up with the 1969 finding: shock’s effect depends on what else is happening at the same time.

You can thin out client aggression by two levers: change the partner and change the consequence. If a client hits more with one peer, try pairing them with a calmer peer first. If that is not enough, talk to the medical team about a medication review. Always measure attack rate; it is an observable behavior that responds quickly to these shifts.