Non-Invasive Brain Stimulation in Dementia: A Complex Network Story

Area of Science:

• Neuroscience
• Neurology
• Rehabilitation Medicine

Background:

• Non-invasive brain stimulation (NIBS) is a developing therapeutic approach for neurodegenerative diseases.
• The precise mechanisms underlying NIBS efficacy remain incompletely understood.
• Neurodegenerative disorders are often characterized by aberrant functional connectivity within large-scale neural networks.

Purpose of the Study:

• To review and synthesize findings from brain imaging studies investigating the therapeutic mechanisms of NIBS.
• To elucidate the relationship between NIBS-induced changes in functional connectivity and metabolites.
• To provide a network-based perspective on NIBS applications in neurodegenerative disorders, particularly dementia.

Main Methods:

• Review of studies combining non-invasive brain stimulation (NIBS) with neuroimaging techniques.
• Analysis of resting-state functional magnetic resonance imaging (rs-fMRI) data to assess network modifications.
• Examination of magnetic resonance spectroscopy (MRS) findings to correlate microscale metabolic changes with network alterations.
• Re-evaluation of existing NIBS studies in dementia through a network connectivity lens.

Main Results:

• NIBS can induce complex modifications in large-scale brain networks, affecting both local and distal regions.
• Studies combining NIBS with rs-fMRI reveal how stimulation parameters influence network dynamics.
• Magnetic resonance spectroscopy (MRS) data suggest a link between microscale metabolic changes and macroscale network alterations following NIBS.
• A network perspective reframes the understanding of NIBS effects in conditions like dementia.

Conclusions:

• Understanding the impact of NIBS on large-scale brain network functionality is crucial for optimizing therapeutic strategies.
• Integrating functional connectivity and metabolic data provides deeper insights into NIBS mechanisms.
• This network-centric approach may facilitate the development of more effective NIBS-based treatments for neurodegenerative disorders.