Reward functioning in PTSD: a systematic review exploring the mechanisms underlying anhedonia

Area of Science:

• Neuroscience
• Psychiatry
• Psychology

Background:

• Post-traumatic stress disorder (PTSD) is a significant psychiatric condition.
• Anhedonia, a core symptom of PTSD, suggests potential deficits in the brain's reward system.
• Systematic investigation of reward functioning in PTSD has been lacking.

Purpose of the Study:

• To systematically review and synthesize existing research on reward functioning in individuals with PTSD.
• To compare reward processing between PTSD patients and healthy controls.
• To examine the relationship between PTSD symptom severity and reward impairments.

Main Methods:

• A systematic review of 29 studies comparing reward functioning in PTSD patients versus healthy controls.
• Studies assessed reward anticipation ('wanting') and hedonic responses ('liking').
• Reward functioning was also investigated in relation to PTSD symptom severity.

Main Results:

• Findings were mixed, but overall indicated decreased reward anticipation, approach, and hedonic responses in PTSD patients compared to controls.
• Reward impairments were more pronounced in female PTSD samples.
• Social positive stimuli most frequently elicited reduced reward responses.

Conclusions:

• This review provides initial evidence for widespread reward system deficits in PTSD.
• These findings suggest potential neurobiological mechanisms underlying anhedonia in PTSD.
• Further research is warranted to fully elucidate the role of reward functioning in PTSD pathophysiology.