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Neurochemistry was a medical science that dealt with the chemical makeup of an organic brain.
In 2372, after Lieutenant Commander Tuvok conducted a Vulcan mind meld with Ensign Lon Suder, The Doctor diagnosed him with a neurochemical imbalance in his mesiofrontal cortex, causing his erratic, violent behavior. (VOY: "Meld")
In 2373, after forcefully attempting to telepathically mate with Lt. jg B'Elanna Torres, Ensign Vorik was diagnosed with a neurochemical imbalance by The Doctor. The Doctor understood this meant Vorik was entering into pon farr. (VOY: "Blood Fever")