Blunted response to feedback information in depressive illness

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Depressive illness presents with cognitive deficits and emotional distress, lacking a unifying theory for its features and treatment response.
• A leading hypothesis suggests depression involves impaired feedback processing, leading to increased error risk due to a failure to adjust performance.

Purpose of the Study:

• To test the hypothesis that depressive illness is associated with blunted behavioral and neural responses to feedback information.
• To investigate reaction time (RT) changes and brain activity (fMRI) in response to feedback during a gambling task in patients with depression and controls.

Main Methods:

• Quantitative modeling of reaction times (RTs) and functional magnetic resonance imaging (fMRI) were employed.
• 15 patients with depressive illness and 14 matched controls performed a gambling task with feedback.

Main Results:

• Healthy controls showed increased RT and anterior cingulate activation after negative feedback, and decreased RT and ventral striatum activation after positive feedback, correlating with performance adjustment.
• Patients with depression did not significantly alter RT or activate the anterior cingulate/ventral striatum in response to feedback.
• RT adjustment correlated with self-reported anhedonia in both groups.

Conclusions:

• Depressive illness is characterized by dysfunctional error correction mechanisms in the anterior midline cortex, evidenced by blunted behavioral and neural responses to feedback.
• This dysfunction links anhedonia, cognitive deficits, and neuroimaging abnormalities in depression.
• Findings suggest a potential mechanism for antidepressant action via monoamine systems and the error correction system.