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Related Experiment Video

Updated: May 1, 2026

Non-Invasive Modulation and Robotic Mapping of Motor Cortex in the Developing Brain
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Phase reversal technique decreases cortical stimulation time during motor mapping.

Mirela V Simon1, Sameer A Sheth2, Christine A Eckhardt3

  • 1Department of Neurology, Massachusetts General Hospital and Harvard Medical School, 55 Fruit Street, Boston, MA 02114, USA.

Journal of Clinical Neuroscience : Official Journal of the Neurosurgical Society of Australasia
|April 1, 2014
PubMed
Summary

Median somatosensory evoked potentials phase reversal technique (MSSEP PRT) accurately identifies the primary motor cortex (PMC), reducing stimulation time during neurophysiologic mapping. This method enhances surgical precision and safety in brain tumor and epilepsy procedures.

Keywords:
Cortical stimulationMotor mappingPhase reversal technique

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Area of Science:

  • Neurosurgery
  • Neurophysiology
  • Medical Imaging

Background:

  • Primary motor cortex (PMC) mapping is crucial in supratentorial surgery, often relying on anatomic landmarks and electrical cortical stimulation.
  • Challenges like anatomical distortion, small surgical fields, brain shifts, and neuronavigation inaccuracies can prolong mapping and increase seizure risk.
  • Accurate PMC localization is vital for safe and efficient neurosurgical procedures.

Purpose of the Study:

  • To evaluate the efficacy of the median somatosensory evoked potentials phase reversal technique (MSSEP PRT) for precise primary motor cortex (PMC) localization.
  • To determine if MSSEP PRT reduces the time required for electrical cortical stimulation to elicit triggered primary motor responses (TPMR).
  • To investigate factors influencing the efficiency of PMC identification during neurosurgical mapping.

Main Methods:

  • A multivariate Cox regression model was employed to analyze data from 100 standardized motor mapping procedures.
  • The study assessed the impact of MSSEP PRT on the time to obtain TPMR, adjusting for cortical excitability, motor thresholds, lesion proximity, and fMRI data.
  • Electrical cortical stimulation was used to elicit TPMR, with MSSEP PRT serving as a localization tool.

Main Results:

  • MSSEP PRT, specifically phase reversal and morphology change of somatosensory evoked potentials, significantly increased the rate of obtaining TPMR (HR 4.13 and 2.14, respectively).
  • Increased motor thresholds and lesions near the PMC, as well as afterdischarges before TPMR, were associated with longer stimulation times.
  • Informative MSSEP PRT was found to decrease overall stimulation time, while adverse events increased it.

Conclusions:

  • The median somatosensory evoked potentials phase reversal technique (MSSEP PRT) is an effective method for accurately and efficiently localizing the primary motor cortex (PMC).
  • Utilizing MSSEP PRT can significantly reduce the duration of electrical cortical stimulation, thereby minimizing risks such as seizures.
  • This technique offers a valuable tool for improving the precision and safety of neurosurgical interventions requiring PMC mapping.