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  "path": "/releases/2026/06/260606075901.htm",
  "publishedAt": "2026-06-08T07:38:21.000Z",
  "site": "https://www.sciencedaily.com",
  "textContent": "Scientists have uncovered a key brain signal that helps us break old habits and adapt when circumstances suddenly change. By watching mice navigate a virtual maze, researchers found that disappointment—when an expected reward failed to appear—triggered a surge of the neurotransmitter acetylcholine, making the animals more likely to try a new strategy. When acetylcholine was blocked, the mice became less flexible and were more likely to stick with outdated choices.",
  "title": "Scientists discover the brain chemical that helps you break bad habits"
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