Biomag 96 pp 943-946 | Cite as

Equivalent Current Sources of the Auditory Evoked Gamma Band and Steady State Fields

  • K. H. Knuth
  • J. H. Broadhurst
  • B. J. Schwartz
Conference paper

Abstract

Neural activity in the auditory cortex of the human brain can be evoked by presenting transient acoustic stimuli to the ear. Using the Magnes Biomagnetometer System at the Scripps Clinic in La Jolla CA, we measured the magnetic fields generated by this neural activity. The auditory steady-state response (SSR), first studied by Galambos et al.1, is a sinusoidal response elicited by periodic trains of auditory click transients presented at rates ranging from 15–70 Hz. Galambos et al. proposed that the SSR was generated by a superposition of the individual transient middle-latency responses.

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References

  1. [1]
    Galambos, R., Makeig, S., and Talmachoff, P.J. A 40 Hz auditory potential recorded from the human scalp., Proc. Nad. Acad. Sci. USA, 1981, 78:2643–2647.ADSCrossRefGoogle Scholar
  2. [2]
    Knuth, K.H., Broadhurst, J.H., Schwartz, B J. Dynamical behavior of the generation of the auditory evoked 40 Hz steady state response. In preparation.Google Scholar
  3. [3]
    Marquardt, D. An algorithm for least-squares estimation of nonlinear parameter. SIAM Journal of Applied Mathematics, 1963, 11:431–441.MathSciNetCrossRefMATHGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2000

Authors and Affiliations

  • K. H. Knuth
    • 1
    • 2
  • J. H. Broadhurst
    • 2
  • B. J. Schwartz
    • 3
  1. 1.Kresge Hearing Research LaboratoryNew OrleansUSA
  2. 2.University of MinnesotaMinneapolisUSA
  3. 3.Scripps ClinicLa JollaUSA

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