Negative Contextual Valence Unmasks Altered Counterfactual Decision-Making in Major Depressive Disorder

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychiatry

Background:

• Counterfactual thinking ('what could have been') is crucial for adaptive decision-making.
• Major Depressive Disorder (MDD) is associated with negative biases and motivational deficits, but its impact on counterfactual thinking is unclear.

Purpose of the Study:

• To investigate how MDD affects counterfactual thinking during economic decision-making.
• To explore the neural mechanisms underlying these effects using functional MRI.

Main Methods:

• A sequential economic decision-making task simulating a stock market was used with 178 adults (with or without MDD).
• A subset (N=53) underwent functional MRI.
• Fictive errors (realized vs. best-possible outcomes) were analyzed under varying contextual valence (positive/negative market changes).

Main Results:

• MDD altered behavioral adjustments to fictive errors, especially under negative market conditions.
• Individuals with MDD showed heightened sensitivity to losses but blunted adjustment to gains.
• Brain imaging revealed heightened ACC activity and attenuated vmPFC-to-ACC coupling in MDD, with vmPFC activity correlating with depression severity.

Conclusions:

• MDD selectively disrupts the use of counterfactual outcomes for adaptive choice in negative contexts.
• Altered frontocingulate function plays a role in maladaptive decision-making in MDD.