Disruptions in the levels of which neurotransmitter can result in behaviour being activated in the absence of a reward, a threat, or other appropriate stimuli?

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Disruptions in the levels of dopamine can result in behaviour being activated in the absence of a reward, a threat, or other appropriate stimuli. Dopamine is a neurotransmitter associated with motivation, pleasure, and reward, and disruptions in its levels have been implicated in various psychiatric disorders such as addiction, ADHD, and schizophrenia.

Disruptions in the Levels of Which Neurotransmitter Can Result in Behaviour