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The Journal of Neurophysiology Vol. 85 No. 5 May 2001, pp. 1969-1985
Copyright ©2001 by the American Physiological Society
Laboratoire de Neurophysiologie, Faculté de Médicine, Université Laval, Quebec G1K 7P4, Canada
Steriade, M.,
I. Timofeev, and
F. Grenier.
Natural Waking and Sleep States: A View From Inside
Neocortical Neurons. J. Neurophysiol. 85: 1969-1985, 2001. In this first intracellular study of neocortical
activities during waking and sleep states, we hypothesized that
synaptic activities during natural states of vigilance have a decisive impact on the observed electrophysiological properties of neurons that
were previously studied under anesthesia or in brain slices. We
investigated the incidence of different firing patterns in neocortical
neurons of awake cats, the relation between membrane potential
fluctuations and firing rates, and the input resistance during all
states of vigilance. In awake animals, the neurons displaying
fast-spiking firing patterns were more numerous, whereas the incidence
of neurons with intrinsically bursting patterns was much lower than in
our previous experiments conducted on the intact-cortex or isolated
cortical slabs of anesthetized cats. Although cortical neurons
displayed prolonged hyperpolarizing phases during slow-wave sleep, the
firing rates during the depolarizing phases of the slow sleep
oscillation was as high during these epochs as during waking and
rapid-eye-movement sleep. Maximum firing rates, exceeding those of
regular-spiking neurons, were reached by conventional fast-spiking
neurons during both waking and sleep states, and by
fast-rhythmic-bursting neurons during waking. The input resistance was
more stable and it increased during quiet wakefulness, compared with
sleep states. As waking is associated with high synaptic activity, we
explain this result by a higher release of activating neuromodulators,
which produce an increase in the input resistance of cortical neurons.
In view of the high firing rates in the functionally disconnected state of slow-wave sleep, we suggest that neocortical neurons are engaged in
processing internally generated signals.
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I. A. Erchova and M. E. Diamond Rapid Fluctuations in Rat Barrel Cortex Plasticity J. Neurosci., June 30, 2004; 24(26): 5931 - 5941. [Abstract] [Full Text] [PDF]
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P. Fuentealba, I. Timofeev, and M. Steriade From The Cover: Prolonged hyperpolarizing potentials precede spindle oscillations in the thalamic reticular nucleus PNAS, June 29, 2004; 101(26): 9816 - 9821. [Abstract] [Full Text] [PDF]
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C. Cirelli and G. Tononi Locus Ceruleus Control of State-Dependent Gene Expression J. Neurosci., June 9, 2004; 24(23): 5410 - 5419. [Abstract] [Full Text] [PDF]
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B. Birtoli and D. Ulrich Firing Mode-Dependent Synaptic Plasticity in Rat Neocortical Pyramidal Neurons J. Neurosci., May 26, 2004; 24(21): 4935 - 4940. [Abstract] [Full Text] [PDF]
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M. O. Cunningham, M. A. Whittington, A. Bibbig, A. Roopun, F. E. N. LeBeau, A. Vogt, H. Monyer, E. H. Buhl, and R. D. Traub A role for fast rhythmic bursting neurons in cortical gamma oscillations in vitro PNAS, May 4, 2004; 101(18): 7152 - 7157. [Abstract] [Full Text] [PDF]
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P. Fuentealba, S. Crochet, I. Timofeev, and M. Steriade Synaptic Interactions Between Thalamic and Cortical Inputs Onto Cortical Neurons In Vivo J Neurophysiol, May 1, 2004; 91(5): 1990 - 1998. [Abstract] [Full Text] [PDF]
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A. Massaux, G. Dutrieux, N. Cotillon-Williams, Y. Manunta, and J.-M. Edeline Auditory Thalamus Bursts in Anesthetized and Non-Anesthetized States: Contribution to Functional Properties J Neurophysiol, May 1, 2004; 91(5): 2117 - 2134. [Abstract] [Full Text] [PDF]
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T. Kobayashi, C. Good, J. Biedermann, C. Barnes, R. D. Skinner, and E. Garcia-Rill Developmental Changes in Pedunculopontine Nucleus (PPN) Neurons J Neurophysiol, April 1, 2004; 91(4): 1470 - 1481. [Abstract] [Full Text] [PDF]
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Y. Shu, A. Hasenstaub, M. Badoual, T. Bal, and D. A. McCormick Barrages of Synaptic Activity Control the Gain and Sensitivity of Cortical Neurons J. Neurosci., November 12, 2003; 23(32): 10388 - 10401. [Abstract] [Full Text] [PDF]
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D. A. McCormick, Y. Shu, A. Hasenstaub, M. Sanchez-Vives, M. Badoual, and T. Bal Persistent Cortical Activity: Mechanisms of Generation and Effects on Neuronal Excitability Cereb Cortex, November 1, 2003; 13(11): 1219 - 1231. [Abstract] [Full Text] [PDF]
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T. Berger, W. Senn, and H.-R. Luscher Hyperpolarization-Activated Current Ih Disconnects Somatic and Dendritic Spike Initiation Zones in Layer V Pyramidal Neurons J Neurophysiol, October 1, 2003; 90(4): 2428 - 2437. [Abstract] [Full Text] [PDF]
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 A. DESTEXHE and T. J. SEJNOWSKI Interactions Between Membrane Conductances Underlying Thalamocortical Slow-Wave Oscillations Physiol Rev, October 1, 2003; 83(4): 1401 - 1453. [Abstract] [Full Text] [PDF]
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J. He Slow Oscillation in Non-Lemniscal Auditory Thalamus J. Neurosci., September 10, 2003; 23(23): 8281 - 8290. [Abstract] [Full Text] [PDF]
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A. Fontanini, P. Spano, and J. M. Bower Ketamine-Xylazine-Induced Slow (< 1.5 Hz) Oscillations in the Rat Piriform (Olfactory) Cortex Are Functionally Correlated with Respiration J. Neurosci., September 3, 2003; 23(22): 7993 - 8001. [Abstract] [Full Text] [PDF]
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