Which of the following describes a primary function of the prefrontal cortex (PFC) in relation to depressive symptoms, and what is the common alteration seen in depression?
Group of answer choices
- The PFC controls motor functions, and increased PFC activity is linked to anhedonia
- The PFC manages sleep cycles, and reduced PFC function leads to insomnia
- The PFC regulates appetite, and decreased PFC activity is associated with hyperphagia
- The PFC is involved in emotional regulation, and reduced PFC activity is associated with depressive symptoms
The correct answer is:
The PFC is involved in emotional regulation, and reduced PFC activity is associated with depressive symptoms
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Explanation:
The prefrontal cortex (PFC) plays a central role in emotional regulation, decision-making, and executive function. In depression, the following alterations are well-documented:
- Primary Function of PFC:
- Top-down control of limbic regions (e.g., amygdala) to modulate emotional responses.
- Dorsolateral PFC (dlPFC): Cognitive control (e.g., rumination).
- Ventromedial PFC (vmPFC): Emotional valuation and inhibition.
- Depression-Related Alterations:
- Reduced PFC activity (hypometabolism on fMRI/PET scans).
- Dysfunctional connectivity with limbic areas, leading to:
- Impaired emotion regulation.
- Rumination (linked to dlPFC deficits).
- Anhedonia (vmPFC-amygdala disconnect).
Why Not the Others?
- Motor functions: Controlled by the motor cortex; PFC’s role is cognitive, not motor.
- Sleep cycles: Regulated by the hypothalamus, brainstem; PFC indirectly affects sleep via stress pathways.
- Appetite: Primarily modulated by the hypothalamus; PFC’s role is in decision-making (e.g., food choices).
Clinical Relevance:
- Antidepressants (e.g., SSRIs) and therapy (e.g., CBT) can normalize PFC activity.
- Transcranial magnetic stimulation (TMS) targets the dlPFC to improve depressive symptoms.
Thus, the PFC’s emotional regulation role and its reduced activity in depression are the key concepts.
