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Re: Limit of phase-locking
No. As the latency-dependence of the N1-component has only reported for spectrally unresolved complex tones, the result of Ragot and Crottaz has to be interpreted in terms of cochler interference patterns, having a periodicity corresponding to the frequency difference between adjacent
harmonics (e.g: harmonics with 800, 900, 1000 Hz: periodicity of 100 Hz). Hence, it is not necessary for the auditory nerve to phase lock to the high spectral components but just to signal envelope, having a much lower periodicity. Therefore, this experiment does not provide any measure of
the upper limit of neural phase-locking in humans.
Chen-gia TSAI wrote:
> Ragot & Crottaz (1998) reported that the N1 brain electrophysiological response can be influenced by the phase of the harmonics, even when these harmonics are in high frequencies (3900-5400 Hz). Does this finding suggest that temporal information is preserved for frequencies above 4 kHz?
> I am looking for recent evidences on the limit of phase-locking. Many thanks for any help!
> Ragot R. & Crottaz S. (1998) A dual mechanism for sound pitch perception: new evidence from brain electrophysiology. NeuroReport, 9, 3123-3127.
> Chen-Gia Tsai
Dr. Annemarie Seither-Preisler
Institut für Experimentelle Audiologie, Biomagnetismuszentrum
Westfälische Wilhelms-Universität Münster
Kardinal von Galen Ring 10
Tel.: 0049 / 251 / 83 / 56817
Fax: 0049 / 251 / 83 / 56882
Personal Homepage: http://biomag.uni-muenster.de/~anne/
Department Homepage: http://biomag.uni-muenster.de/ExpAud/index_e.html