Cholinergic induction of network oscillations at 40 Hz in the hippocampus in vitro

Article Abstract:

Acetylcholine is essential for the brain's cognitive functions, although its effects at the network level are not clearly understood. The hippocampus receives cholinergic input and exhibits network activity at 40 Hz during relevant behaviours. It is shown that the cholinergic activation can induce 40 Hz network oscillations in the hippocampus in vitro, indicating a role for the subcortical cholinergic input in controlling hippocampal memory processing.

Cholinergic mechanisms

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A cortical representation of the local visual environment

Article Abstract:

It has been established that there is a region of parahippocampal cortex that responds selectively to visual scenes showing places. Activation in this region takes place automatically even when no explicit cognitive test is needed. The region, named the parahippocampal place area, only responds weakly to single objects and not at all to faces. It is suggested that this region represents places by encoding the geometry of the local environment.

Higher nervous activity

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Electrical coupling underlies high-frequency oscillations in the hippocampus in vitro

Article Abstract:

Coherent oscillations are believe to be important in higher brain functions. Such discharges in the hippocampus are categorized according to their frequency. It is reported that high-frequency network oscillations occur in rate brain slices in vitro, as a brief series of repetitive population spikes in the cell layers. This is the result of direct electrotonic coupling of neurons, rather than chemical synaptic transmission.

Oscillation, Oscillations

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