Somatotopic source arrangement of 600 Hz oscillatory magnetic fields at the human primary somatosensory hand cortex

Based on low-noise superconducting quantum interference devices (SQUIDs) magnetoencephalography allows the non-invasive detection of low-amplitude high-frequency brain responses evoked about 20 ms after electric hand nerve stimulation. The main spectral energy of these brief oscillatory bursts (near...

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Bibliographic Details
Published in:Neuroscience letters 1997-10, Vol.234 (2), p.131-134
Main Authors: Curio, Gabriel, Mackert, Bruno-Marcel, Burghoff, Martin, Neumann, Joachim, Nolte, Guido, Scherg, Michael, Marx, Peter
Format: Article
Language:English
Subjects:
Biological and medical sciences
Brain Mapping - methods
Fundamental and applied biological sciences. Psychology
Hand - innervation
Humans
Magnetoencephalography
Median nerve
Oscillation
Oscillometry
Primary somatosensory cortex
Somatosensory Cortex - physiology
Somatotopy
Somesthesis and somesthetic pathways (proprioception, exteroception, nociception)
interoception
electrolocation. Sensory receptors
SQUID
Superconducting quantum interference device
Ulnar nerve
Vertebrates: nervous system and sense organs
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Summary:Based on low-noise superconducting quantum interference devices (SQUIDs) magnetoencephalography allows the non-invasive detection of low-amplitude high-frequency brain responses evoked about 20 ms after electric hand nerve stimulation. The main spectral energy of these brief oscillatory bursts (near 600 Hz) is in the range typical for rapidly repeated action potentials. Here, the magnetic fields of median and ulnar nerve evoked 600 Hz bursts are shown to exhibit a somatotopic arrangement at the primary somatosensory hand cortex closely resembling that of the concomitant postsynaptic primary cortical response (`N20m'). Two possible burst generators are discussed: (1) repetitive spike volleys conducted along the terminal segments of somatotopically arranged thalamocortical axons, and (2) early intracortical spike activity in nerve-specific subterritories of the 3b hand area.
ISSN:0304-3940
1872-7972
DOI:10.1016/S0304-3940(97)00690-3