Adaptation of firing rate and spike-timing precision in the avian cochlear nucleus.
J Neurosci
; 28(46): 11906-15, 2008 Nov 12.
Article
en En
| MEDLINE
| ID: mdl-19005056
ABSTRACT
Adaptation is commonly defined as a decrease in response to a constant stimulus. In the auditory system such adaptation is seen at multiple levels. However, the first-order central neurons of the interaural time difference detection circuit encode information in the timing of spikes rather than the overall firing rate. We investigated adaptation during in vitro whole-cell recordings from chick nucleus magnocellularis neurons. Injection of noisy, depolarizing current caused an increase in firing rate and a decrease in spike time precision that developed over approximately 20 s. This adaptation depends on sustained depolarization, is independent of firing, and is eliminated by alpha-dendrotoxin (0.1 microM), implicating slow inactivation of low-threshold voltage-activated K+ channels as its mechanism. This process may alter both firing rate and spike-timing precision of phase-locked inputs to coincidence detector neurons in nucleus laminaris and thereby adjust the precision of sound localization.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Localización de Sonidos
/
Aves
/
Potenciales de Acción
/
Adaptación Fisiológica
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Núcleo Coclear
/
Neuronas
Límite:
Animals
Idioma:
En
Revista:
J Neurosci
Año:
2008
Tipo del documento:
Article
País de afiliación:
Estados Unidos