Spatiotemporal properties of an evoked population activity in rat sensory cortical slices.

Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Research Abstract Details 

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Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Abstract Text:

J Y Wu,L Guan,L Bai,Q Yang,

We have examined the spatiotemporal properties of ensemble activity, an evoked all-or-none polysynaptic activity in rat neocortical slices. Ensemble activity occurred in cortical slices bathed in normal artificial cerebrospinal fluid (ACSF) and was evoked by a single electrical shock either to the white matter or directly to the cortical tissue. This activity was seen in slices of somatosensory and auditory cortices; in other cortical areas we have not been able to evoke it. The activity developed 10 to 250 ms poststimulus and lasted 280 +/- 120 ms in local field potential (LFP) recordings. Voltage-sensitive dye imaging showed that this activity was an area of activation 0.8 +/- 0.4 mm wide that propagated slowly (11.4 +/- 6.2 mm/s, n = 60, 6 animals) in the horizontal direction. Due to this propagation, the actual duration in the whole tissue may be longer (approximately 400 ms) than that recorded by a single LFP electrode. Ensemble activity produced a low-amplitude optical signal (7-14% of the interictal-like spikes in the same tissue), suggesting a moderate net depolarization of the population. These were very different from hyperexcitable (epileptiform) events in the same tissue that had about 10 times the optical signal amplitude and propagated at 125 +/- 24 mm/s (n = 21, 6 animals). On a global spatial scale (approximately 0.8 mm wide in layers II-III) ensemble activity had a smooth waveform in voltage-sensitive dye signals (population transmembrane potential). On a local scale, field potential recordings showed large fluctuations with complex oscillations and substantial trial-to-trial variation. This suggests that oscillations in cortical circuits occurred only in small clusters of correlated neurons. Ensemble activity was sensitive to the excitation-inhibition balance of the local network. Antagonists of N-methyl-D-aspartate, alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid, and GABAa receptors, and muscarinic agonists and other modest manipulations such as increasing bath concentration of Mg(2+) to 2.5-4 mM (normally at 2 mM), or K(+) to 5-7 mM (normally 3 mM), all significantly reduced the probability of evoking the activity. The metabotropic glutamate receptor agonist, aminocyclopentane-1,3-dicarboxylic acid, blocked the activity at a low concentration (10-15 microM), while the antagonist (R,S)-alpha-methyl-4-carboxyphenylglycine had no effect even at high concentration (240 microM). Our data suggest that locally organized neuronal clusters may play a role in the organization of oscillatory activities in the gamma band and may participate in cortical integration/amplification occurring on a scale of approximately 1 mm x 300 ms.

Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Publishing Authors By Initials

JY Wu,L Guan,L Bai,Q Yang,

For similar natural sciences: time: time factors research abstracts see: natural sciences: time: time factors research

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Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Journal of neurophysiology

VOLUME: 86

Page Numbers: 2461-74

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 1

MONTH: Nov

YEAR: 2001

Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Information

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LANGUAGE: eng

NlmUniqueID: 375404

Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Keywords Mesh Terms:

KEYWORDS: Time Factors

MESH TERMS: physiology

Chemical & Substance for Abstract: Spatiotemporal properties of an evoked population activity in rat sensory cortical slices. Information

Substance Name: Bicuculline

Registry Number: 485-49-4

Grant and Affiliation Information for Spatiotemporal properties of an evoked population activity in rat sensory cortical slices.

AFFILIATION: Department of Physiology and Biophysics, Georgetown University Medical Center, Washington, DC 20007, USA. wuj@georgetown.edu

Country: United States

AGENCY: United States NINDS

GRANT: R01 NS036447-03

ACRONYM: NS

MEDLINETA: J Neurophysiol

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