Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex.

Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Research Abstract Details 

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Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Abstract Text:

Han Xu,Vibhakar C Kotak,Dan H Sanes,

Although sensorineural hearing loss (SNHL) is known to compromise central auditory structure and function, the impact of milder forms of hearing loss on cellular neurophysiology remains mostly undefined. We induced conductive hearing loss (CHL) in developing gerbils, reared the animals for 8-13 d, and subsequently assessed the temporal features of auditory cortex layer 2/3 pyramidal neurons in a thalamocortical brain slice preparation with whole-cell recordings. Repetitive stimulation of the ventral medial geniculate nucleus (MGv) evoked robust short-term depression of the postsynaptic potentials in control neurons, and this depression increased monotonically at higher stimulation frequencies. In contrast, CHL neurons displayed a faster rate of synaptic depression and a smaller asymptotic amplitude. Moreover, the latency of MGv evoked potentials was consistently longer in CHL neurons for all stimulus rates. A separate assessment of spike frequency adaptation in response to trains of injected current pulses revealed that CHL neurons displayed less adaptation compared with controls, although there was an increase in temporal jitter. For each of these properties, nearly identical findings were observed for SNHL neurons. Together, these data show that CHL significantly alters the temporal properties of auditory cortex synapses and spikes, and this may contribute to processing deficits that attend mild to moderate hearing loss.

Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Publishing Authors By Initials

H Xu,VC Kotak,DH Sanes,

For similar nervous system: central nervous system: brain: prosencephalon: diencephalon: thalamus research abstracts see: nervous system: central nervous system: brain: prosencephalon: diencephalon: thalamus research

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Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The Journal of neuroscience : the official journal

VOLUME: 27

Page Numbers: 9417-26

Journal Abbreviation: J. Neurosci.

ISSN: 1529-2401

DAY: 29

MONTH: Aug

YEAR: 2007

Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Information

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LANGUAGE: eng

NlmUniqueID: 8102140

Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex. Keywords Mesh Terms:

KEYWORDS: Thalamus

MESH TERMS: pathology

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Grant and Affiliation Information for Conductive hearing loss disrupts synaptic and spike adaptation in developing auditory cortex.

AFFILIATION: Center for Neural Science, New York University, New York, New York 10003, USA.

Country: United States

AGENCY: United States NIDCD

GRANT: DC006864

ACRONYM: DC

MEDLINETA: J Neurosci

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