Which pathway is associated with negative symptoms of schizophrenia due to decreased dopamine?

Which pathway is associated with negative symptoms of schizophrenia due to decreased dopamine?

• A. Mesocortical pathway
• B. Mesolimbic pathway
• C. Nigrostriatal pathway
• D. Tuberoinfundibular pathway

Answer: (A)

Understanding how dopamine pathways relate to schizophrenia helps explain why certain symptoms appear. The mesocortical pathway, from the ventral tegmental area to the prefrontal cortex, shows reduced dopaminergic activity in some patients. This decrease is linked to negative symptoms such as avolition, anhedonia, social withdrawal, flat affect, and cognitive difficulties. By contrast, the mesolimbic pathway to the nucleus accumbens is often associated with positive symptoms when dopamine is elevated. The nigrostriatal pathway (substantia nigra to striatum) is tied to movement, and blocking dopamine here can cause extrapyramidal symptoms. The tuberoinfundibular pathway (hypothalamus to the pituitary) governs prolactin release, with dopamine inhibition increasing prolactin. So, decreased dopamine in the mesocortical pathway best explains the negative symptom cluster.

Understanding how dopamine pathways relate to schizophrenia helps explain why certain symptoms appear. The mesocortical pathway, from the ventral tegmental area to the prefrontal cortex, shows reduced dopaminergic activity in some patients. This decrease is linked to negative symptoms such as avolition, anhedonia, social withdrawal, flat affect, and cognitive difficulties. By contrast, the mesolimbic pathway to the nucleus accumbens is often associated with positive symptoms when dopamine is elevated. The nigrostriatal pathway (substantia nigra to striatum) is tied to movement, and blocking dopamine here can cause extrapyramidal symptoms. The tuberoinfundibular pathway (hypothalamus to the pituitary) governs prolactin release, with dopamine inhibition increasing prolactin. So, decreased dopamine in the mesocortical pathway best explains the negative symptom cluster.