Steinschneider & Co (Annemarie Seither-Preisler )

Subject: Steinschneider & Co
From:    Annemarie Seither-Preisler  <preisler(at)UNI-MUENSTER.DE>
Date:    Tue, 24 Oct 2000 22:39:17 +0100

Dear List, thank you for your interesting comments! Yes, the line of argumentation by Peter Cariani is quite comprehensible. There should be only one predominant phase locking periodicity in the high frequency-MUA - that of the envelope. So the absence of phase locking information in MUA and CSD recordings at low frequency sites is not per se an argument for a rate place transformation in the midbrain, as suggested by Langner et al., but may be simply due to mutual cancellation of different periodicities. I suppose that one reason for the failure of spectral encoding in the high frequency regions, also reported by Steinschneider et al., may be that only unresolved components stimulated these sites (BF 2600 Hz: stimulation rates from 75-150 Hz, phase locking up to about 125 Hz; BF 5 kHz: stimulation rates between 10 and 500 Hz, phase locking up to about 200 Hz). So it would be interesting to see what happens when these sites are stimulated with higher rates where the harmonics in the BF-regions are still resolved. Best regards, Annemarie Seither-Preisler -- Dr. Annemarie Seither-Preisler Department of Experimental Audiology Biomagnetism Centre University of M=FCnster Kardinal von Galen-Ring 10 48129 M=FCnster Germany Tel.: ++49 251 83 52543 Fax: ++49 251 83 56882 private: Tel. and Fax: ++49 2573 957927

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