In 1954, two researchers at Canada's McGill University accidentally discovered how humans learn to repeat conduct that's useful to our survival. An electrode implanted within the mind of a rat had slipped from its intended place and had come to rest on the medial forebrain bundle, a group of nerve cells that leads from deep in the brain to the prefrontal cortex. Upon delivering a series of electrical shocks to the electrode, the rat displayed a keen curiosity in the world of its box it had been exploring when it acquired the primary jolt. Upon further investigation, Olds and Mind Guard testimonials Milner realized that what they'd found was the brain's reward center, a system of regions related to delivering a way of pleasure in return for certain behaviors like consuming and mating. This discovery was revolutionary