Circuit-Based Deep Brain Stimulation (NCT05658302)

Circuit-Based Deep Brain Stimulation for Parkinson's Disease

Overview

This clinical trial investigates the circuit mechanisms underlying deep brain stimulation (DBS) therapy for Parkinson's disease (PD). Unlike traditional DBS which delivers constant electrical stimulation, this observational study aims to understand how DBS modulates neural circuits to produce its therapeutic effects. By characterizing the neural circuits involved, this research seeks to optimize DBS targeting and stimulation parameters for improved patient outcomes.

Circuit-Based Deep Brain Stimulation for Parkinson's Disease

Overview

This clinical trial investigates the circuit mechanisms underlying deep brain stimulation (DBS) therapy for Parkinson's disease (PD). Unlike traditional DBS which delivers constant electrical stimulation, this observational study aims to understand how DBS modulates neural circuits to produce its therapeutic effects. By characterizing the neural circuits involved, this research seeks to optimize DBS targeting and stimulation parameters for improved patient outcomes.

The study represents a shift from "what works" to "why it works" — using advanced neural recording and behavioral assessments to map the circuit-basis of DBS therapeutic mechanisms.

Trial Details

| Parameter | Value |
|-----------|-------|
| NCT Number | NCT05658302 |
| Status | Recruiting |
| Phase | Not Applicable (Observational) |
| Sponsor | University of Minnesota |
| Study Type | Observational |
| Enrollment | 30 participants (estimated) |
| Start Date | March 28, 2023 |
| Completion Date | March 1, 2028 |
| Location | Minneapolis, Minnesota, USA |

Scientific Rationale

Why Study DBS Circuit Mechanisms?

Despite decades of DBS use for Parkinson's disease, the precise neural mechanisms remain incompletely understood. DBS is believed to work through multiple pathways:

This study uses behavioral paradigms and neural recordings to disentangle these mechanisms.

Circuit-Based Approach

The "circuit-based" framework views PD as a circuit disorder — where dysfunction in specific neural circuits (rather than single brain regions) produces symptoms. By mapping which circuits are modulated during different behaviors, researchers can:

• Identify optimal stimulation targets
• Develop adaptive stimulation algorithms
• Predict individual patient responses
• Reduce side effects through targeted modulation

Study Design

Assessment Paradigms

The trial uses several behavioral paradigms to probe circuit function:

Reach-Related Modulation

Reach-related tasks assess motor [cortex](/brain-regions/cortex) and corticospinal circuit function. Patients perform reaching movements while neural signals are recorded, allowing researchers to examine:

• Movement-related neural activity
• Cortico-basal ganglia interactions
• Reach trajectory planning and execution

N-Back Task

The N-back task is a working memory paradigm that probes prefrontal cortex and frontostriatal circuits:

• 0-back: Match current stimulus to specific target
• 1-back: Match current stimulus to previous one
• 2-back: Match current stimulus to one two back

Motor Assessments

Standardized assessments evaluate classical PD motor symptoms:

• Rigidity — Muscle tone assessment
• Bradykinesia — Slowness of movement
• Other UPDRS motor subscores

Neural Recording Technology

The study likely employs sensing-enabled DBS electrodes (such as Medtronic Percept PC) that can record local field potentials (LFPs) from deep brain structures:

• Subthalamic nucleus (STN) — Common DBS target for PD
• Globus pallidus interna (GPi) — Alternative target
• Cortical recordings — Surface EEG or intracranial electrodes

Target Neural Circuits

Basal Ganglia-Thalamocortical Circuit

The primary target of DBS research:

• Input: Cortex → Striatum → GPi/SNr
• Output: GPi/SNr → Thalamus → Cortex
• PD dysfunction: Excessive inhibition, beta-frequency synchronization

Cortico-Striatal Circuit

Working memory and skill learning:

• Dorsolateral prefrontal cortex → Caudate nucleus
• Premotor cortex → Putamen
• PD dysfunction: Reduced dopaminergic modulation

Cerebello-Thalamic Circuit

Increasingly recognized in PD:

• Cerebellum → Thalamus → Motor cortex
• Role: Movement timing, error correction
• Potential DBS target for dyskinesias

Significance for Parkinson's Disease Treatment

Optimizing DBS Therapy

Understanding circuit mechanisms enables:

Clinical Implications

This mechanistic research supports the development of next-generation DBS:

• Adaptive DBS — Responds to neural markers (e.g., beta oscillations)
• Multi-target stimulation — Modulates multiple circuits simultaneously
• Temporal patterns — Optimizes stimulation timing for specific circuits

Related Pages

• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Deep Brain Stimulation](/therapeutics/deep-brain-stimulation)
• [Adaptive DBS](/technologies/adaptive-dbs)
• [Subthalamic Nucleus](/cell-types/subthalamic-nucleus-neurons)
• [Globus Pallidus](/cell-types/globus-pallidus-internal-segment-neurons)
• [Basal Ganglia](/brain-regions/basal-ganglia)
• [Motor Cortex](/brain-regions/motor-cortex)
• [Working Memory Circuit](/mechanisms/working-memory-circuit)
• [Clinical Trials in Parkinson's Disease](/clinical-trials/parkinsons-disease)
• [Medtronic](/companies/medtronic)

See Also

• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/)
• [KEGG Pathways](https://www.genome.jp/kegg/pathway.html)

Contact Information

• [Sponsor**: University of Minnesota](/brain-regions/pons)
• [Location**: Minneapolis, Minnesota, USA](/genes/cat)
• [ClinicalTrials.gov**: [NCT05658302](https://clinicaltrials.gov/study/NCT05658302)](/diseases/amyotrophic-lateral-sclerosis)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving Circuit-Based Deep Brain Stimulation (NCT05658302) discovered through SciDEX knowledge graph analysis: