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Animals build a model of their surroundings on the basis of information gathered during exploration. Rearing on the hindlimbs changes the vantage point of the animal, increasing the sampled area of the environment. This environmental knowledge is suggested to be integrated into a cognitive map stored by the hippocampus. Previous studies have found that damage to the hippocampus impairs rearing. Here,...
In this paper we show that gamma oscillations can be elicited by brief (=<200 ms) local applications of glutamate in the dentate gyrus of rat hippocampal slices. Dentate gamma oscillations show an initial peak frequency of ~70 Hz and last for up to 4 min. The network activity involves functional GABA A receptors as it is drastically reduced by GABA A receptor antagonists. The oscillations...
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