On Killing: The Psychological Cost of Learning to Kill in War and Society

by Dave Grossman

Martin Seligman developed the concept of inoculation from stress from his famous studies of learning in dogs. He put dogs in a cage that had an electric shock pass through the floor at random intervals. Initially the dogs would jump, yelp, and scratch pitifully in their attempts to escape the shocks, but after a time they would fall into a depressed, hopeless state of apathy and inactivity that Seligman termed “learned helplessness.” After falling into a state of learned helplessness, the dogs would not avoid the shocks even when provided with an obvious escape route. Other dogs were given a means of escape after receiving some shocks but before falling into learned helplessness. These dogs learned that they could and would eventually escape from the shocks, and after only one such escape they became inoculated against learned helplessness. Even after long periods of random, inescapable shocks, these inoculated dogs would escape when finally provided with a means to do so.