Spatio-temporal interaction of evoked magnetic fields in primary auditory and somatosensory cortex of awake humans

Srikantan S. Nagarajan, Henry Mahncke, David Poeppel, Timothy P.L. Roberts, Howard A. Rowley, Michael M. Merzenich

Research output: Contribution to journalConference article

Abstract

We determined the primary cortical evoked magnetic field responses to brief somatosensory and auditory stimuli in awake humans. These responses comprise of evoked coherent low-frequency oscillations in the range of 4-15 Hz lasting for 100-300 ms. Responses to pairs of stimuli occurring at various inter-stimulus intervals interact non-linearly. Latencies between the peaks of the evoked response were linearly related to the intervals between stimuli, reflecting high fidelity representation of stimulus intervals in both primary cortical areas. The sources of the different cycles of these oscillations and the sources of responses to stimulus pairs both localize to the same cortical area, indicating that the observed responses reflect changes in underlying cortical excitability. The potential origins and functional role of these oscillations in the processing and representation of temporal information on this time-scale are discussed.

Original languageEnglish (US)
Pages (from-to)1504-1507
Number of pages4
JournalAnnual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings
Volume4
StatePublished - 1997
EventProceedings of the 1997 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society - Chicago, IL, USA
Duration: Oct 30 1997Nov 2 1997

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering
  • Computer Vision and Pattern Recognition
  • Health Informatics

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