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Related Concept Videos

Somatosensation01:33

Somatosensation

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The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.
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Somatosensory, Motor, and Association Cortex01:23

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The somatosensory cortex in the parietal lobes is crucial for interpreting sensory data such as touch, temperature, and proprioception. The somatosensory cortex, situated in the parietal lobes, plays a vital role in interpreting sensory information like touch, temperature, and proprioception—awareness of body position. This specialized brain region features an organized structure wherein neurons at the top primarily process sensations originating from the lower body. In contrast, those at...
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Reliability for non-invasive somatosensory cortex localization: Implications for pre-surgical mapping.

Jack Solomon1, Shaun Boe2, Timothy Bardouille3

  • 1Laboratory for Brain Recovery and Function, Dalhousie University, 5869 University Avenue, Halifax, Nova Scotia, Canada B3H 1X7; Department of Psychology and Neuroscience, Dalhousie University, 1355 Oxford Street, Halifax, Nova Scotia, Canada B3H 4R2.

Clinical Neurology and Neurosurgery
|November 1, 2015
PubMed
Summary

Inter-session reliability of magnetoencephalography (MEG) for mapping the somatosensory cortex (S1) showed a mean localization difference of 8.3mm. This suggests a confidence interval for pre-surgical mapping in epilepsy patients.

Keywords:
Intersession reliabilityMagnetoencephalographyMedian nerve stimulationNeurosurgeryPre-surgical mappingSomatosensory cortexSource localization

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Epilepsy Research

Background:

  • Pre-surgical neuroimaging is crucial for planning epilepsy surgery.
  • Magnetoencephalography (MEG) offers non-invasive cortical mapping, aligning with invasive findings.
  • The inter-session reliability of MEG for pre-surgical mapping requires further investigation.

Purpose of the Study:

  • To quantify the inter-session reliability of MEG-based localization of the somatosensory cortex (S1).
  • To establish confidence intervals for MEG pre-surgical mapping.

Main Methods:

  • Eighteen healthy individuals underwent three consecutive daily MEG sessions.
  • Clinical-style S1 localization used electrical stimulation of the median nerve.
  • Localization employed a single equivalent current dipole model on the 35 ms somatosensory evoked field peak.
  • Intersession reliability was assessed using Average Euclidean Distance (AED) and Session Euclidean Distance (SED).

Main Results:

  • The Average Euclidean Distance (AED) was 4.8 ± 1.9 mm.
  • The Session Euclidean Distance (SED) was 8.3 ± 3.4 mm.
  • SED values were substantially larger than previously reported in smaller sample sizes.

Conclusions:

  • MEG pre-surgical mapping of S1 demonstrates an inter-session reliability with a mean localization difference of approximately 8mm.
  • Clinicians should incorporate an 8mm confidence interval around MEG-estimated S1 locations for pre-surgical planning.
  • These findings are vital for optimizing resection margins in epilepsy surgery.