Hippocampal Electrical Activity in Arousal

Green, John D.; Arduini, A

doi:10.1152/jn.1954.17.6.533

Cited by 1,283 publications

(503 citation statements)

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“…HIPPOCAMPAL THETA RHYTHMS-The most prominent oscillation in the mammalian brain is the hippocampal theta rhythm (6-12 Hz) (Green and Arduni, 1954) that is present mainly during locomotion and other 'voluntary' movements (Vanderwolf, 1969) and REM sleep (Jouvet, 1969). A crucial structure involved in theta oscillations is the medial septum-diagonal band of Broca (MSDB), because its lesion or disconnection from the hippocampus abolishes theta (Green and Arduni, 1954;Petsche et al, 1962).…”

Section: Slow (<1 Hz) Rhythms-mirceamentioning

confidence: 99%

“…A crucial structure involved in theta oscillations is the medial septum-diagonal band of Broca (MSDB), because its lesion or disconnection from the hippocampus abolishes theta (Green and Arduni, 1954;Petsche et al, 1962). GABAergic and cholinergic neurons of the MSDB contribute to the theta rhythm by feed-forward disinhibition of CA1 pyramidal cells via the interneurons, and cholinergic activation of an intrahippocampal CA3 theta oscillator (Buzsáki, 2002).…”

Section: Slow (<1 Hz) Rhythms-mirceamentioning

confidence: 99%

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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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Section: Slow (<1 Hz) Rhythms-mirceamentioning

confidence: 99%

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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“…These effects cannot be f ully accounted for by sensory or motor deficits (Rapp et al, 1987;Gallagher and Pelleymonter, 1988;Gage et al, 1989), suggesting that alterations in hippocampal function with age may contribute to their etiology. There are three particularly striking aspects of hippocampal electrophysiology that have attracted interest with respect to their possible roles in spatial learning, and the change with age of which could contribute to age-associated memory impairment: place-specific firing (O'Keefe and Dostrovsky, 1971) of single neurons ("place cells"); the 7-12 Hz theta rhythm in the EEG (Green and Arduini, 1954), which is tightly related to "spatial" behaviors (e.g., walking and rearing) (Vanderwolf et al, 1975); and the longlasting change in synaptic efficacy that can be induced by patterned activation of hippocampal afferents [i.e., long-term potentiation (LTP)] (Bliss and Gardner-Medwin, 1973;Bliss and Lømo, 1973).…”

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confidence: 99%

The Effect of Aging on Experience-Dependent Plasticity of Hippocampal Place Cells

et al. 1997

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The firing characteristics of 1437 CA1 pyramidal neurons were studied in relation to both spatial location and the phase of the theta rhythm in healthy young and old rats performing a simple spatial task on a rectangular track. The old rats had previously been found to be deficient on the Morris spatial learning task. Age effects on the theta rhythm per se were minimal. Theta amplitude and frequency during rapid eye movement sleep were virtually identical. During behavior, theta frequency was slightly reduced with age. In both groups, cell firing occurred at progressively earlier phases of the theta rhythm as the rat traversed the place field of the cell (i.e., there was "phase precession," as reported by others). The net phase shift did not differ between age groups. The main finding of the study was a loss of experience-dependent plasticity in the place fields of old rats. During the first lap around the track on each day, the initial sizes of the place fields were the same between ages; however, place fields of young rats, but not old, expanded significantly during the first few laps around the track in a given recording session. As the place fields expanded, the rate of change of firing with phase slowed accordingly, so that the net phase change remained constant. Thus changes in field size and phase precession are coupled. A deficit in plasticity of place fields in old rats may lead to a less accurate population code for spatial location.

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“…It influences learning and memory by way of connections to the hippocampus. Green and Arduini (1954) implicated the septum as a vital component of the hippocampal theta rhythm; they found that unilateral lesions to the septum or the pathways connecting the septum to the hippocampus abolished theta waves in the ipsilateral hippocampus. Morgane, Galler, and Mokler (2005) reviewed the influence of theta activation on long term potentiation (LTP) or neuroplasticity.…”

Section: The Septummentioning

confidence: 99%