Differential distribution of β and θ EEG activity in the entorhinal cortex of the cat

Boeijinga, Peter H.; Silva, F.H. Lopes da

doi:10.1016/0006-8993(88)91264-4

Cited by 49 publications

(36 citation statements)

References 37 publications

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“…Boeijinga and Lopes da Silva (1989) consider beta to be a subharmonic of the gamma oscillation. Their recordings were made in cats, in which the gamma oscillation is substantially slower (mean 38 Hz) (Boeijinga and Lopes da Silva 1988;Bressler and Freeman 1980) than in the rat, and the beta oscillation occurs at approximately half this frequency. Our analysis indicates that the frequency of the gamma oscillation is not an integral multiple of the frequency of the beta oscillation (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…It is coherent both within and between the two structures (Boeijinga and Lopes da Silva 1988;Bressler 1984Bressler , 1987Freeman 1978;Kay and Freeman 1998). The amplitude and frequency of this oscillation may reflect previous olfactory experience and the behavior of the animal (Boeijinga and Lopes da Silva 1989;Bressler 1988;Chabaud et al 2000;Freeman 1960;Freeman and Schneider 1982;Freeman and Viana di Prisco 1986;Kay and Freeman 1998;Ravel et al 2003).…”

Section: Introductionmentioning

confidence: 95%

“…The gamma oscillation has been described in field potential recordings from the OB and PC of awake animals (Boeijinga and Lopes da Silva 1988;Bressler 1984;Freeman 1959Freeman , 1978Kay and Freeman 1998) and animals anesthetized with urethane (Adrian 1950;Kashiwadani et al 1999;Mori et al 1992). It is coherent both within and between the two structures (Boeijinga and Lopes da Silva 1988;Bressler 1984Bressler , 1987Freeman 1978;Kay and Freeman 1998).…”

Section: Introductionmentioning

confidence: 99%

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Beta and Gamma Oscillations in the Olfactory System of the Urethane-Anesthetized Rat

Neville

Haberly

2003

Journal of Neurophysiology

275

268

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. Beta and gamma oscillations in the olfactory system of the urethane-anesthetized rat. J Neurophysiol 90: 3921-3930, 2003. First published August 13, 2003 10.1152/jn.00475.2003. Fast oscillations in the beta (15-40 Hz in awake rats) and gamma (50 -100 Hz) frequency ranges are prominent in field potentials induced by odorants in the mammalian olfactory bulb (OB) and piriform cortex (PC). Whereas the gamma oscillation has been studied for Ͼ50 yr, the beta oscillation has attracted attention only recently, and its origin, mechanism, and relationship to gamma are unknown. To address these questions, we have examined responses induced by odorants in the urethane-anesthetized rat-a preparation well-suited for the analysis of mechanisms. We found that both oscillations could be induced by odorants in a concentrationdependent manner. Analysis with a concentration series and spectral methods revealed that the beta and gamma oscillations were distinct and not harmonically related, indicating generation by independent mechanisms. The beta oscillation was synchronous at sites Յ4 mm apart in the OB, the greatest distance tested. In contrast, the gamma oscillation was synchronous in some experiments and asynchronous in others (frequency differed slightly at different sites, resulting in progressive phase shifts). Current source-density analysis indicated that, for both oscillations, the field potentials in the OB were generated by synaptic currents in granule cells. The two oscillations were differently affected by surgical interruption of the lateral olfactory tract. This lesion abolished the beta oscillation, whereas the gamma oscillation was still induced in the OB. Our results confirm previous reports that the gamma oscillation is generated within the OB but indicate that the beta oscillation requires the participation of PC.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Beta and Gamma Oscillations in the Olfactory System of the Urethane-Anesthetized Rat

Neville

Haberly

2003

Journal of Neurophysiology

275

268

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“…Gamma oscillations are a characteristic feature of network activity in 'desynchronized' cortical areas involved in processing of incoming sensory information in the awake state or during REM sleep (Singer and Gray, 1995;Maloney et al, 1997). Gamma oscillations have also been observed in vivo in the hippocampus and the entorhinal cortex of rats (Stumpf, 1965;Buzsáki et al, 1983;Chrobak and Buzsáki, 1998a;Bragin et al, 1995a), the amygdala, the entorhinal and perirhinal cortices and the neocortex of cats (Boeijinga and Lopes da Silva, 1988;Gray et al, 1989;Engel et al, 1991;Collins et al, 2001), the neocortex of the monkeys (Kreiter and Singer, 1996) and in the human neocortex (Llinás and Ribary, 1993;Uchida et al, 2001). Gamma oscillations are also induced by various pharmacological manipulations in vitro Buhl et al, 1998;Fisahn et al, 1998).…”

Section: Slow (<1 Hz) Rhythms-mirceamentioning

confidence: 99%

Interaction between neocortical and hippocampal networks via slow oscillations

Sirota

Buzsáki

2005

THL

230

219

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Both the thalamocortical and limbic systems generate a variety of brain state-dependent rhythms but the relationship between the oscillatory families is not well understood. Transfer of information across structures can be controlled by the offset oscillations. We suggest that slow oscillation of the neocortex, which was discovered by Mircea Steriade, temporally coordinates the self-organized oscillations in the neocortex, entorhinal cortex, subiculum and hippocampus. Transient coupling between rhythms can guide bidirectional information transfer among these structures and might serve to consolidate memory traces.

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“…A third known pattern is the low-amplitude fast activity or gamma oscillation (40-100 da Silva, 1988;Skaggs et al, 199 1;Leung, 1992). Synchronous gamma activity has been extensively studied in several other structures of the brain (Freeman and Skarda, 1985;Gray et al, 1989;Gray, 1993Gray, , 1994Llintis and Ribary, 1993;Freeman 1994;Singer, 1994).…”

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confidence: 99%

Gamma (40-100 Hz) oscillation in the hippocampus of the behaving rat

et al. 1995

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The cellular generation and spatial distribution of gamma frequency (40– 100 Hz) activity was examined in the hippocampus of the awake rat. Field potentials and unit activity were recorded by multiple site silicon probes (5- and 16-site shanks) and wire electrode arrays. Gamma waves were highly coherent along the long axis of the dentate hilus, but average coherence decreased rapidly in the CA3 and CA1 directions. Analysis of short epochs revealed large fluctuations in coherence values between the dentate and CA1 gamma waves. Current source density analysis revealed large sinks and sources in the dentate gyrus with spatial distribution similar to the dipoles evoked by stimulation of the perforant path. The frequency changes of gamma and theta waves positively correlated (40–100 Hz and 5–10 Hz, respectively). Putative interneurons in the dentate gyrus discharged at gamma frequency and were phase-locked to the ascending part of the gamma waves recorded from the hilus. Following bilateral lesion of the entorhinal cortex the power and frequency of hilar gamma activity significantly decreased or disappeared. Instead, a large amplitude but slower gamma pattern (25–50 Hz) emerged in the CA3-CA1 network. We suggest that gamma oscillation emerges from an interaction between intrinsic oscillatory properties of interneurons and the network properties of the dentate gyrus. We also hypothesize that under physiological conditions the hilar gamma oscillation may be entrained by the entorhinal rhythm and that gamma oscillation in the CA3-CA1 circuitry is suppressed by either the hilar region or the entorhinal cortex.

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Differential distribution of β and θ EEG activity in the entorhinal cortex of the cat

Cited by 49 publications

References 37 publications

Beta and Gamma Oscillations in the Olfactory System of the Urethane-Anesthetized Rat

Beta and Gamma Oscillations in the Olfactory System of the Urethane-Anesthetized Rat

Interaction between neocortical and hippocampal networks via slow oscillations

Gamma (40-100 Hz) oscillation in the hippocampus of the behaving rat

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