A transdiagnostic, multi-modal approach to understanding apathy: Methodological and analytical framework.

Area of Science:

• Neuroscience
• Neurology
• Psychiatry

Background:

• Apathy, marked by reduced motivation and goal-directed behavior, significantly impacts quality of life in neurodegenerative diseases like Alzheimer's Disease (AD) and Parkinson's Disease (PD).
• Current treatments for apathy are limited due to an incomplete understanding of its underlying cognitive and neuroanatomical mechanisms.
• Effort-based decision-making (EBDM) paradigms offer a way to mechanistically study apathy by examining choices between tasks with varying effort and reward.

Purpose of the Study:

• To evaluate the effects of reward and effort sensitivity on apathy in individuals with AD and PD, exploring their role as a link between neurodegeneration and basal ganglia-frontal networks.
• To determine if electrical manipulation of the subthalamic nucleus (STN) via deep brain stimulation (DBS) in Parkinson's Disease (PD) patients alters reward/effort processing and goal-directed behavior.
• To advance the understanding of how neurodegeneration and neuromodulatory interventions like DBS influence apathy, guiding clinical decision-making and therapeutic development.

Main Methods:

• A transdiagnostic study design involving individuals with AD and PD.
• Utilizing effort-based decision-making (EBDM) paradigms to assess reward and effort sensitivity.
• Investigating the impact of deep brain stimulation (DBS) on reward/effort processing and goal-directed behavior in a subset of PD patients.

Main Results:

• (Study protocol - results pending) This study protocol outlines a multimodal approach to investigate apathy mechanisms.
• (Study protocol - results pending) The research aims to differentiate the effects of neurodegeneration and neuromodulation on apathy.
• (Study protocol - results pending) Findings are expected to elucidate the shared and disease-specific neuroanatomical, functional, and behavioral underpinnings of apathy.

Conclusions:

• (Study protocol - conclusions pending) A comprehensive understanding of apathy's mechanisms in neurodegenerative diseases is crucial for developing targeted interventions.
• (Study protocol - conclusions pending) This research provides a framework for investigating apathy across different neurodegenerative conditions.
• (Study protocol - conclusions pending) The findings will inform clinical strategies for managing apathy and improving patient outcomes.