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An investigation of the auditory frequency-following responses as compared to cochlear potentials

Eine Untersuchung der frequenzfolgenden Potentiale des Gehörs im Vergleich zu cochleären Potentialen

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Zusammenfassung

Beim Chinchilla und beim Menschen wurden die Cochlear Microphonics (CM) und die an der Kopfhaut abgeleiteten frequenzfolgenden Potentiale (FFR) verglichen. Im Verhältnis zu den CM lag die Latenz der an Kopfhaut bzw. Ohrläppchen abgeleiteten Frequenzfolgepotentiale (FFR) nahezu bei Null. Weiterhin zeigte sich, daß die Nervenaktionspotentiale nach dem Tod rasch abnahmen, während der Anteil der CM in den FFR nur allmählich abnahm. Die Abnahme der CM-Komponente in den FFR, nach dem Tod an der Kopfhaut gemessen, und die Abnahme der CM am runden Fenster zeigen zeitlich den gleichen Verlauf.

Diese Beobachtung läßt den Schluß zu, daß die FFR nicht im Hirnstamm entstehen, sondern daß sie im wesentlichen cochleare Potentiale sind, die durch Elektroden an der Kopfhaut registriert werden.

Summary

Comparisons were made of cochlear microphonics (CM) and scalp recorded frequency-following responses (FFR) from chinchilla and human. The latency of the scalp/ear-lobe recorded FFR was found to be nearly zero with respect to CM. Further, auditory nerve action potential were noted to diminish rapidly after death whereas the CM component in FFR reduced gradually. The decay of the CM component of FFR measured at the scalp after death followed an identical time course to that of the CM at round window. These observation lead to the conclusion that FFR does not originate in the brain stem but is essentially cochlear potentials picked up by electrodes located at the scalp.

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References

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Correspondence to S. M. Hou Ph.D..

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Hou, S.M., Lipscomb, D.M. An investigation of the auditory frequency-following responses as compared to cochlear potentials. Arch Otorhinolaryngol 222, 235–240 (1979). https://doi.org/10.1007/BF00456321

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Schlüsselwörter

  • Frequenzfolgende Potentiale
  • Cochlear Microphonics (CM)

Key words

  • Frequency-following responses (FFR)
  • Cochlear microphonics (CM)