Anhedonia as a Transdiagnostic Symptom Across Psychological Disorders: A Network Approach.

Area of Science:

• Psychiatry
• Clinical Psychology
• Neuroscience

Background:

• Anhedonia is observed across various mental disorders, potentially linked to reward system or affect regulation dysfunctions.
• It may represent a shared characteristic influencing symptom severity in diverse psychiatric conditions.

Purpose of the Study:

• To investigate the network relationships between anhedonia severity and symptom clusters of major depressive disorder (MDD), anxiety sensitivity (AS), attention-deficit hyperactivity disorder (ADHD), and autism spectrum disorder (ASD).
• To determine if anhedonia acts as a transdiagnostic feature predicting symptom severity across these disorders.

Main Methods:

• A cross-sectional study involving 557 Dutch adult psychiatric patients.
• Construction of graphical Least Absolute Shrinkage and Selection Operator (LASSO) and relative importance networks to analyze interrelationships between symptom severities.

Main Results:

• Anhedonia severity and depression symptom severity emerged as central nodes in both network analyses.
• Anhedonia severity was found to be predictive of symptom severity across MDD, AS, ADHD, and ASD.
• MDD symptom severity also predicted AS and ADHD symptom severity.

Conclusions:

• Anhedonia may function as a transdiagnostic psychopathological feature, predicting symptom severity in depression, AS, ADHD, and ASD.
• This finding suggests anhedonia could explain the high comorbidity observed between these conditions.
• Clinicians should consider screening for anhedonia and depression severity in individuals with anxiety disorders, ADHD, or ASD.