Which dopaminergic tract extends from the ventral tegmental area to the amygdala and limbic system, and is associated with positive psychotic symptoms when overactive?

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Dopamine plays distinct roles in several brain pathways, and the one extending from the ventral tegmental area to limbic structures like the amygdala and nucleus accumbens is the mesolimbic pathway. When this tract is overactive, dopamine levels rise in the limbic system, which is linked to the emergence of positive psychotic symptoms such as hallucinations and delusions. This is why increased mesolimbic dopamine activity is a classic explanation for positive symptoms and why antipsychotic medications that block dopamine D2 receptors in this pathway can help reduce them.

In contrast, the mesocortical pathway from the VTA to the prefrontal cortex is more associated with negative symptoms and cognitive deficits when underactive. The tuberoinfundibular tract runs from the hypothalamus to the pituitary and regulates prolactin; dopamine here inhibits prolactin release, so blocking this pathway can lead to hyperprolactinemia rather than psychotic symptoms. Norepinephrine is a different neurotransmitter system altogether, not a dopaminergic tract.