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    Temporal processing from the auditory nerve to the medial nucleus of the trapezoid body in the rat

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    Author
    Paolini, AG; FitzGerald, JV; Burkitt, AN; Clark, GM
    Date
    2001-09-01
    Source Title
    HEARING RESEARCH
    Publisher
    ELSEVIER SCIENCE BV
    University of Melbourne Author/s
    Paolini, Antonio; Burkitt, Anthony; Clark, Graeme; FITZGERALD, JOHN VINCENT
    Metadata
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    Document Type
    Journal Article
    Citations
    Paolini, A. G., FitzGerald, J. V., Burkitt, A. N. & Clark, G. M. (2001). Temporal processing from the auditory nerve to the medial nucleus of the trapezoid body in the rat. HEARING RESEARCH, 159 (1-2), pp.101-116. https://doi.org/10.1016/S0378-5955(01)00327-6.
    Access Status
    This item is currently not available from this repository
    URI
    http://hdl.handle.net/11343/27589
    DOI
    10.1016/S0378-5955(01)00327-6
    Description

    Publisher’s permission requested and denied.

    Abstract
    This investigation examines temporal processing through successive sites in the rat auditory pathway: auditory nerve (AN), anteroventral cochlear nucleus (AVCN) and the medial nucleus of the trapezoid body (MNTB). The degree of phase-locking, measured as vector strength, varied with intensity relative to the cell's threshold, and saturated at a value that depended upon stimulus frequency. A typical pattern showed decline in the saturated vector strength from approximately 0.8 at 400 Hz to about 0.3 at 2000 Hz, with similar profiles in units with a range of characteristic frequencies (480-32,000 Hz). A new expression for temporal dispersion indicates that this variation corresponds to a limiting degree of temporal imprecision, which is relatively consistent between different cells. From AN to AVCN, an increase in vector strength was seen for frequencies below 1000 Hz. At higher frequencies, a decrease in vector strength was observed. From AVCN to MNTB a tendency for temporal coding to be improved below 800 Hz and degraded further above 1500 Hz was seen. This change in temporal processing ability could be attributed to units classified as primary-like with notch (PL(N)). PL(N) MNTB units showed a similar vector strength distribution to PL(N) AVCN units. Our results suggest that AVCN PL(N) units, representing globular bushy cells, are specialised for enhancing the temporal code at low frequencies and relaying this information to principal cells of the MNTB.
    Keywords
    auditory nerve; cochlear nucleus; medial nucleus of the trapezoid body; temporal processing

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