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J Neurophysiol (April 20, 2005). doi:10.1152/jn.01226.2004
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01226.2004v1
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Submitted on December 1, 2004
Accepted on April 7, 2005

Microsecond precision of phase delay in the auditory system of the barn owl

Hermann Wagner*, Sandra Brill, Richard Kempter, and Catherine E. Carr

* To whom correspondence should be addressed. E-mail: wagner{at}bio2.rwth-aachen.de.

The auditory system encodes time with sub-millisecond accuracy. To shed new light on the basic mechanism underlying this precise temporal neuronal coding, we analyzed the neurophonic potential, a characteristic multiunit response, in the barn owl's nucleus laminaris. We report here that the relative time measure of phase delay is robust against changes in sound level, with a precision sharper than 20 microseconds. Absolute measures of delay, such as group delay or signal-front delay, had much greater temporal jitter, for example due to their strong dependence on sound level. Our findings support the hypothesis that phase delay underlies the sub-millisecond precision of the representation of interaural time difference needed for sound localization.




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