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Archives of oto-rhino-laryngology

, Volume 228, Issue 4, pp 249–258 | Cite as

Age-related changes in the auditory evoked brainstem

Potentials of Albino and pigmented guinea pigs
  • Norbert Dum
  • Uwe Schmidt
  • Hasso von Wedel
Article

Summary

The auditory evoked brainstem responses of guinea pigs in two age groups were recorded and examined for evidence of age-dependent changes at peripheral stations in the auditory pathway. Because pigmented guinea pigs have been found to be less sensitive to sounds than albinos, both groups were included in this study. Old and young animals did not differ in response latency or in the conduction times associated with the individual potentials. By contrast, the amplitudes of the brainstem responses to high-frequency stimuli were distinctly reduced in old guinea pigs, with no difference in the dynamic of the amplitude between the two age groups. Within each age group, albino and pigmented animals resembled one another in all parameters studied. The effect of the aging process at the peripheral stations of the auditory pathway is discussed in the light of these results.

Key words

Auditory brainstem potentials Age-relation Guinea pig Albinism/pigmentation 

Altersbedingte Veränderungen akustisch evozierter Hirnstammpotentiale

Bei Albino- und pigmentierten Meerschweinchen

Zusammenfassung

Zur Erfassung altersspezifischer Veränderungen peripherer Hörbahnstationen wurden akustisch evozierte Hirnstammantworten bei Meerschweinchen zweier Altersstufen untersucht. Da Angaben über Unterschiede in der Hörleistung von Albino- und pigmentierten Meerschweinchen vorliegen, wurden beide Kollektive in die Untersuchung einbezogen. Im Latenzverhalten wiesen beide Altersstufen keine Unterschiede auf; ebenso ließ sich für die Laufzeitdifferenz der einzelnen Potentiale kein Alterseinfluß feststellen. Die Amplitude der Hirnstammantworten dagegen zeigte sich bei alten Meerschweinchen für hohe Frequenzen deutlich reduziert, wobei das dynamische Verhalten der Amplitude beider Altersgruppen keine Unterschiede aufwies. Albino- und pigmentierte Meerschweinchen entsprachen sich in beiden Altersgruppen in den Größen der untersuchten Parameter. Der Einfluß des Alterungsprozesses auf die peripheren Hörbahnstationen wird auf Grund der ermittelten Ergebnisse diskutiert.

Schlüsselwörter

Hirnstammpotentiale Gehör Altersabhängigkeit Meerschweinchen Albinimus/Pigmentation 

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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • Norbert Dum
    • 1
    • 2
  • Uwe Schmidt
    • 2
  • Hasso von Wedel
    • 1
  1. 1.Univ.-Klinik und Poliklinik für HNO-KrankheitenBonn-VenusbergGermany
  2. 2.Zoologisches und Vergleichend-Anatomisches Institut der Universität BonnBonnGermany

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