Developmental Trajectories of Anhedonia in Preclinical Models

Area of Science:

• Neuroscience
• Behavioral Science
• Psychiatry

Background:

• Anhedonia, a core symptom in various psychiatric disorders, involves deficits in reward processing.
• Understanding anhedonia requires distinguishing between motivational and consummatory aspects of reward behavior.

Purpose of the Study:

• To review the operationalization and study of anhedonia in preclinical models.
• To explore the molecular, epigenetic, and network mechanisms underlying anhedonia-like behaviors.
• To examine the role of early-life adversity in the development of anhedonia.

Main Methods:

• Review of experimental approaches, including chemogenetics and optogenetics, for studying anhedonia-like behaviors.
• Analysis of conceptual constructs such as salience, valence, and conflict in reward processing.
• Overview of current knowledge on brain circuits, neurotransmitters, and receptors involved in hedonic behaviors.

Main Results:

• Preclinical models allow for the investigation of diverse mechanisms contributing to anhedonia.
• Early-life adversity serves as a model to study causality, mechanisms, and sex differences in anhedonia.
• Refined experimental tools and conceptual frameworks enhance the study of anhedonia.

Conclusions:

• Preclinical models are powerful tools for advancing the understanding of anhedonia's origins and mechanisms.
• These models offer potential for discovering targets for anhedonia prevention and mitigation.
• Limitations of preclinical models in studying anhedonia are acknowledged.