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Your mind possesses a unique ability to regulate your immune system. New scientific research demonstrates that individuals can learn to activate specific regions within the brain to strengthen the body’s natural defenses through directed thinking. This discovery marks a significant advancement in understanding how mental states influence physical health. It suggests that the brain is not merely a passenger in the body but a driver of physiological change.
The idea that the brain influences the body is not a new concept. Tor Wager, a neuroscientist at Dartmouth University in Hanover, New Hampshire, notes that this concept has existed for a long time. However, he points out that only in the last few years have scientists made "real breakthroughs in understanding the neuroscience behind this." These advances allow researchers to see exactly how thoughts trigger biological changes. For decades, the link between mind and body was largely theoretical. Now, modern imaging technology provides concrete evidence of this connection.
Positive expectations activate a part of the brain’s reward system. This region is responsible for the feelings of pleasure we experience from eating good food, winning a game, or receiving a compliment. Nerve cells in this area release dopamine, a chemical that signals reward. When these cells fire, they do more than just create happiness; they initiate a chain reaction that affects the entire body. This chemical process links mental states to physical actions, creating a pathway through which thoughts can alter health outcomes.
Tamar Koren, a physician scientist at Tel Aviv Medical Center in Israel, led a team that explored this connection. They used genetic methods to stimulate "reward" cells in mice. Turning on these neurons produced surprising health benefits. The mice became better at fighting bacterial infections. They also recovered more quickly from heart attacks. Perhaps most impressively, stimulating the animals’ reward circuit slowed the growth of tumors. These results proved that activating the reward system has tangible, protective effects on physical health.
The results were so promising that the team wanted to see if the same approach could work for humans. However, the genetic and molecular tools used in mice cannot be used in people for ethical reasons. Scientists cannot simply alter human genes to test these effects. Instead, Koren’s team decided to train people to activate their own reward circuits using their thoughts. They published the details of this method in Nature Medicine on January 19, 2021. This shift from genetic manipulation to cognitive training opened a new avenue for therapeutic intervention.