Coupling of Systems by Oscillations
Oscillatory packaging of information can define the length of messages and allows for efficient exchange of information across anatomical domains. Messages can be exchanged by forced oscillations, resonant loops, or transient oscillatory coupling. Neocortical neurons various allo- and neocortical regions are phase-locked transiently to hippocampal oscillations. The advantage of this is that assembly messages can reach the hippocampus at times (phases) when its receiving state is optimal. Exchange of information between the hippocampus and neocortex continues when the brain is disengaged from the environment (“offline” states), although at a different temporal scale. The CA3 recurrent collateral system brings about short-lived fast oscillations in the target CA1-subiculum-parasubiculum-entorhinal cortex output circuits, known as the sharp-wave-ripple complex. The ubiquitous and simultaneous presence of multiple oscillators in various parts of the brain often leads to transient cross-frequency coupling or phase-modulation of the power of a faster event by a slower oscillator.
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