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Limit of phase-locking

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