PAIN-AGGRESSION TOWARD INANIMATE OBJECTS.

Scientists gave rats short electric shocks through the floor grid.

After each shock the rat could bite, push, or claw a small object in the cage.

They turned the shock up in small steps and timed how long the rat attacked the object.

One rat was studied across many sessions to see the exact curve.

When the shock got stronger the rat spent more time attacking the object.

The attack began faster and lasted longer as voltage rose.

Even the lowest shock that could be felt produced some aggression.

The relation was smooth—no sudden jumps—so pain-driven aggression can be measured like any other behavior.

Witts et al. (2024) built on this idea with people. Instead of shock they used loud noise and boring tasks. Their new lab games let you rank how aversive a stimulus is for each client, moving from rat shock curves to human comfort charts.

Ghaziuddin et al. (1996) swapped shock for noise in hens. The birds pecked the key that turned the noise off, and the bias grew with noise volume. The same straight-line rule appeared: stronger aversive, stronger behavior.

Byrne et al. (2000) looked at aggression as a problem to solve, not a measure. They used DRO to cut aggression after brain injury. Both papers count each aggressive act, but one produces it, the other removes it.

You now know that aversive events create measurable aggression, and the size of the behavior tells you how intense the aversive is. Use this when you probe potential reinforcers or side effects. If a client hits furniture right after a loud noise or tough demand, think of it as data, not just problem behavior. You can test demand size the way H et al. tested shock: present small versions, clock the reaction, and stop before the curve climbs.