Stimulus frequency processing in awake rat barrel cortex.

Stimulus frequency processing in awake rat barrel cortex. Research Abstract Details 

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Stimulus frequency processing in awake rat barrel cortex. Abstract Text:

Peter Melzer,Robert N S Sachdev,Ned Jenkinson,Ford F Ebner,

In awake rats, we examined the relationship between neural spiking activity in primary somatic sensory cortex and the frequency of whisker stimulation. Neural responses were recorded extracellularly in barrel cortex while single whiskers were deflected with 0.5-18 air puffs per second (apps), a range that includes the whisk rates observed when rats explore their environment and discriminate surfaces with their whiskers. Twenty-nine neurons in layers III and IV were isolated in three rats (23 in barrel columns and 6 in septum columns). At < or = 9 apps, cortical neurons responded with one to two spikes per stimulus, whereas at > 9 apps, the response efficacy was reduced to only 0.2-0.4 spikes per stimulus. Several mechanisms are discussed that could account for the decrement in responsiveness. Despite this adaptation, neural spike rates increased in direct proportion with stimulus frequency when cast on logarithmic scales. At > 9 apps, however, this relationship deteriorated in barrel columns in which the response approximately halved. In contrast, septum column cells continued to increase their spike rates linearly up to 18 apps, although they responded at lower magnitude than the barrel column cells. Our findings suggest that septum column neurons are potential candidates to encode stimulus frequency using spike rate across the entire frequency range relevant to rats' whisking behavior.

Stimulus frequency processing in awake rat barrel cortex. Publishing Authors By Initials

P Melzer,RN Sachdev,N Jenkinson,FF Ebner,

For similar arousal: wakefulness research abstracts see: arousal: wakefulness research

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Stimulus frequency processing in awake rat barrel cortex. Journal Published:

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

Journal: The Journal of neuroscience : the official journal

VOLUME: 26

Page Numbers: 12198-205

Journal Abbreviation: J. Neurosci.

ISSN: 1529-2401

DAY: 22

MONTH: Nov

YEAR: 2006

Stimulus frequency processing in awake rat barrel cortex. Information

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LANGUAGE: eng

NlmUniqueID: 8102140

Stimulus frequency processing in awake rat barrel cortex. Keywords Mesh Terms:

KEYWORDS: Wakefulness

MESH TERMS: innervation

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Grant and Affiliation Information for Stimulus frequency processing in awake rat barrel cortex.

AFFILIATION: Department of Psychology, Vanderbilt University, Nashville, Tennessee 37203, USA. peter.melzer@vanderbilt.edu

Country: United States

AGENCY: United States NINDS

GRANT: NS-25907

ACRONYM: NS

MEDLINETA: J Neurosci

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