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J Neurophysiol (May 10, 2006). doi:10.1152/jn.00916.2005
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Submitted on September 1, 2005
Accepted on May 3, 2006

Improvement of phase information at low sound frequency in nucleus magnocellularis of the chicken

Iwao Fukui1, Tatsuo Sato1, and Harunori Ohmori1*

1 Physiology, Kyoto University, Kyoto, Japan

* To whom correspondence should be addressed. E-mail: ohmori{at}nbiol.med.kyoto-u.ac.jp.

Nucleus magnocellularis (NM) is one of the subnuclei of the avian cochlear nucleus and has a role of extracting the temporal information of sound from the auditory nerve fibers (ANFs). Neurons in NM are varied along the tonotopic axis in synaptic transmission and membrane excitability, and are high-fidelity relay neurons at the high to middle characteristic frequency (CF) regions. Here, we have compared the firing properties between ANFs and NM neurons in vivo, and found, particularly in the CF lower than 500 Hz, that spike firings are more phase-locked in NM than in ANFs; the NM shows reduced occurrence of multiple spikes within one cycle of sound stimuli and higher vector strength. The improved phase-locked firing nature of NM is discussed in relation to the in vitro findings of small EPSCs in the low CF neurons (Fukui and Ohmori, 2004). It is concluded that NM neurons are not simple relay neurons in the low CF region but are coincidence detectors of monoaural synaptic inputs that improve the synchronization of spike firing to auditory inputs.




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