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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Gross potentials recorded from the cochlea of the skinkTiliqua rugosa (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 719-727 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Compound action potentials (CAP), summating potentials (SP) and both fundamental and second harmonic components of the cochlear microphonic (CM) were recorded from the round window and scala tympani in response to gated and continuous pure tones. The high-pass characteristics of the round-window tissues distorted the evoked d.c. response and the superimposed CAP (Fig. 2) and there was some cancellation of the resulting SP and first negative component of the CAP (Fig. 3). SP sensitivity estimates derived from the scala tympani were more sensitive than those of the round window; a.c. potentials were unaffected (Fig. 4). The SP intensity curves were found to be the most reproducible of the gross response components (Figs. 5, 6, 7). Although there was considerable variation in the group CM data, there were reproducible idiosyncrasies in the intensity curves of individuals which were attributed to unique asymmetries in the basilar papilla causing an asymmetrical stimulation of oppositely polarized hair cells. Multiple maxima in lizard CM intensity curves described by other authors are explained by different mechanisms. The general shapes of the CM and SP sensitivity curves were in agreement with those reported in previous studies (Fig. 8).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01350225
    Location Call Number Limitation Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Gross potentials recorded from the cochlea of the skinkTiliqua rugosa (1984)
    Springer
    Journal of comparative physiology 154 (1984), S. 729-738 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The summating potential (SP) recorded from the scala tympani increased eight to ten-fold during spring (Fig. 1). The sensitivity of hearing as judged by the gross response components also increased in the same period (Figs. 2, 3). The overall effect, from an optimum in spring, was an oblique shift in the intensity curves of all gross response components to the poorer responses at other times of the year. Mechanisms explaining the seasonal changes, in terms of a change to the electrical tuning properties of cochlear hair cells, are evident in (1) the oblique shift in the intensity curves, (2) increased temperature sensitivity of the SP (Figs. 5, 6), (3) a change in the relationship between the fundamental and frequency doubling a.c. response with overall changes in sensitivity (Fig. 7), and (4) a significant association between increased hearing responsiveness and metabolic rate (Figs. 8, 9).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01350226
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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