Experimental Brain Research

, Volume 8, Issue 1, pp 1–18 | Cite as

Evoked response correlates of psychophysical magnitude estimates for tactile stimulation in man

  • Ove Franzén
  • Kurt Offenloch


Cortical responses evoked by transient sensory stimulation of the index and middle fingers were recorded from the scalp over the contralateral primary somatic projection area in man. Stimulus amplitude and locus were systematically varied. The relationship between stimulus intensity and the magnitude of the evoked response is adequately described by a power function. The exponent of the psychophysical function generated under similar stimulus conditions is of approximately the same size. A mathematical model is presented to describe and predict spatial summation. A complete isomorphism between psychological and neurophysiological events is obtained.

Key Words

Somatosensory System Evoked Responses Psychophysics Man 


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Copyright information

© Springer-Verlag 1969

Authors and Affiliations

  • Ove Franzén
    • 1
    • 2
  • Kurt Offenloch
    • 1
    • 3
  1. 1.Center for Communication SciencesResearch Laboratory of Electronics, Massachusetts Institute of TechnologyCambridgeUSA
  2. 2.Neurologiska Kliniken Karolinska SjukhusetStockholmSverige
  3. 3.Institut für Animalische Physiologie J.W. Goethe-UniversitätFrankfurt a./MDeutschland

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