A standardized motor threshold estimation procedure for transcranial magnetic stimulation research

Area of Science:

• Neuroscience
• Neurology
• Biomedical Engineering

Background:

• Transcranial magnetic stimulation (TMS) is a non-invasive brain stimulation technique.
• Accurate determination of motor threshold (MT) is crucial for effective TMS application.
• Standardization of MT estimation procedures is needed for reliable research and clinical outcomes.

Purpose of the Study:

• To introduce a simple, standardized 5-step motor threshold (MT) estimation procedure.
• To evaluate the inter-rater reliability of the proposed MT estimation method.
• To assess the applicability of the procedure in transcranial magnetic stimulation (TMS) research.

Main Methods:

• A novel 5-step MT estimation protocol was developed.
• Inter-rater reliability was assessed using a double-blind design.
• MT values were compared between an experienced and a trainee TMS researcher.

Main Results:

• The Pearson correlation coefficient between the MTs determined by the experienced and trainee researchers was 0.95.
• The high correlation (P < 0.001) indicates strong agreement between raters.
• The proposed procedure yielded consistent MT values.

Conclusions:

• The introduced 5-step MT estimation procedure is simple and effective.
• The method demonstrates high reliability for determining motor thresholds in TMS.
• This standardized procedure can enhance the consistency of MT values in experimental and clinical TMS applications.