HomeNewIntroductionQuantum Mind BlogQuantum Mind TheoriesRelated TopicsKey ArticlesReferencesContact UsOnline Book

Related Topics
aesthetics
Anterior cingulate
Anterior cingulate and rewards foregone
Attention versus consciousness
Blindsight & qualia
Busaki: Neural oscillations
Conscious & unconscious vision
Consciousness and executive function
Consciousness as crosstalk
Consciousness v. information
Consciousness, the self & altered states
Coordination and cognition
Coordination between brain regions
Coordination in neural circuits
Correlates of consciousness
Decision making in the frontal cortex
Dendritic spines
Descartes Error
Dopamine and decision making
Dopamine and motivation
Dreams, embodiment & consciousness
Eagleman, the orbitofrontal and Libet
Edmund Rolls: DEcision making
Edmund Rolls: Decision making and consciousness
Empathy circuit
Flexibility in the brain
Flexibility of preferences
Free won't
Gamma and other rhythms
Gamma oscillations
Gamma synchrony and consciousness
Gestalt view of consciousness
Glial cells
I of the Vortex
Implications of anaesthesia
Individual neuron spiking and gamma synchrony
Invalidation of thalamocortical theories
Joseph Le Doux
Machine consciousness
Microtubules and coherent excitations
Nanoneuroscience
Neural circuits weight the options
Neural integration
Neural mechanism that radomnises behaviour
Neurobiology of preferences
Neuronal explosions and perceptual awareness
Neuronal selectivity
Neuronal selectivity and invariance
Neuronal synchronisation and consciousness
Neurons not a switch
Neurophysics of consciousness
Neuroplasticity & mental force
Neuroscience: Short notes
Neurotransmitter release
Oscillation supported information processing
Pain and emotional assessment
Perception and action paths
Perception without perceiver
Perception, action and consciousness
Perception, reporting & neurons
Positive emotionality and the orbitofrontal
Predicting emotional reactions
Protophenomena
Reward and decision circuits
Reward and decision making
Reward value and the orbitofrontal
Selective neurons
Self-organisation
Single cells, proteins & ions
Single-neuron responses
Single-neurons and subjective vision
Small world and chaos
Subcortical structures & cognition
Subjective response and the orbitofrontal
Subjective values in the ventromedial
Subjectivity and the brain
Susan Greenfield: The singularity
Test for entanglement
The amygdala
The Emotional Brain
The Executive Brain
The orbitofrontal cortex
The water melon story
Two visual systems model
Whole Brain

Oscillation supported information processing

Oscillation-supported information processing and transfer at the hippocampus-entorhinal- neocortical interface

Gyorky Buzsaki & Kamran Diba

In:- Dynamic Coordination in the Brain: From Neurons to Mind – Eds. Christoph von der Malsburg, William Phillips & Wolf Singer

Oscillatory coupling is suggested to both package information, and to facilitate an exchange of information. Two network patterns are prominent in the hippocampal system. These are theta oscillation at 4-10 Hz and sharp waves at 140-200 Hz. Theta is associated with preparatory activity and REM sleep. Neocortical to hippocampus information flow takes place during theta oscillation, while hippocampal to neocortex information flow involves sharp waves. The theta oscillation occurs across the whole hippocampal region and derives from a variety of electrical oscillations including membrane voltage oscillations. The theta oscillations can have gamma oscillations nested within them. These are generated by interneurons or the interaction of interneurons and other cells. Neurons that discharge within the same gamma cycle are defined as a neural assembly.

In the hippocampus, theta oscillations can be replaced by sharp waves (SPW). These are related to synchronous discharges from pyramidal cells and are associated with synaptic changes. It has been hypothesised that the sharp waves are crucial to transferring memories from the hippocampus to the cortex to become part of long-term memory. This hypothesis is supported by experimental data, and it is also thought that the sharp waves relate to recent waking experience. Oscillations and synchrony are seen as creating conditions for transfer of information between different brain structures. The transfer of information from the hippocampus to the neocortex is during sleep. In the waking state the flow of information based on theta oscillations is in the opposite direction. In this state the neocortex produces gamma bursts that arrive back at the hippocampus at a phase of the theta cycle. The hippocampus generates sharp waves during sleep, at which time much of the neocortex has a very low frequency. The sleep spindles seen in the thalamocortical system are associated with this process of information transfer from the hippocampus to the neocortex.