Neuronal threshold functions: Determining symptom onset in neurological disorders.

Area of Science:

• Neuroscience
• Systems Biology
• Pathophysiology

Background:

• Brain function relies on complex synaptic networks.
• Parkinson's Disease (PD) is a multisystem disorder affecting both central and peripheral nervous systems.
• Understanding network limitations is crucial for treating brain disorders.

Purpose of the Study:

• Introduce the
• threshold theory
• to explain PD symptom emergence.
• Provide a quantitative framework for understanding synaptic and cellular network limitations in PD.
• Explain how multisystem pathologies lead to specific symptoms when functional thresholds are crossed.

Main Methods:

• Conceptual framework development based on existing evidence.
• Analysis of PD as a system disorder.
• Delineation of threshold functions in a quantitative, synaptic, and cellular network context.

Main Results:

• PD symptomatology arises when neuronal and network functional reserves are depleted below critical thresholds.
• The
• threshold theory
• explains the sequential development of PD symptoms.
• The theory accounts for symptom emergence due to crossing tipping points in multisystem pathologies.

Conclusions:

• Neurodegenerative diseases like PD are multisystem disorders, challenging brain-centric views.
• The proposed threshold functions offer a framework for understanding symptom development in PD.
• This framework can aid in developing targeted interventions for pre- and post-symptomatic neurodegenerative disease stages.