In 1967, Leonard Berkowitz and Anthony LePage conducted an experiment suggesting that the mere presence of weapons increases aggressive thoughts and behavior — a phenomenon they called the weapons effect, or weapons priming.

The Experiment

Participants were angered by a confederate and then given the opportunity to administer electric shocks (as supposed feedback on a task). In some rooms, a rifle and revolver were visible on the table, explained as being left by a previous participant. In other conditions, neutral objects (badminton rackets) or nothing were present.

The Results

Participants administered more and longer shocks when weapons were visible — even though the weapons were completely irrelevant to the task.

The Mechanism

Weapons are strongly associated with aggression in long-term memory. Their presence activates the associated network, lowering the threshold for aggressive behavior — a priming effect.

Policy Relevance

The weapons effect has been cited in debates about gun presence in homes and public spaces. The research suggests that objects don't merely wait passively to be used — their presence influences behavior through associative activation.

Reference:

Wikipedia: Weapons Effect

https://en.wikipedia.org/wiki/Weapons_effect