Cortico-hippocampal interplay and the representation of contexts in the brain
When the cerebral cortex represents the outside world, many small portions of information from that world may be inherently ambiguous; but nevertheless, their ambiguity can be resolved if the wider context in which they occur is also specified. It is argued that, using schemes of representation so far envisaged (such as cell assemblies), there are fundamental limitations to the use of contexts to resolve ambiguity, which are set by the limited number of connections each cortical neurone makes with its neighbours. A theory of how the hippocampal theta rhythm can entrain populations of neurones in the cerebral cortex into resonant neural activity is developed and discussed in relation to connectional neuroanatomy, innate behaviour, learning of new behaviour and neuronal models of the hippocampus. In addition, many aspects of the theta rhythm are discussed, such as sources of control, neuronal sources of generation, effect of lesions, and neuronal models of the hippocampus.
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Designs for a Prototype Cerebral Cortex
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Adey afferents Ammon's horn amplitude anaesthetized animal areas association cortex atropine axons behavioural correlates Brain Res brainstem Buzsaki cats Chapter cholinergic cingulate cortex connections context cortical dendrites dentate gyrus dorsal elicited entorhinal cortex environment etal evidence extinction field CA1 firing free moving rat global cell assemblies granule cells Hebbian hippocampal complex hippocampal EEG hippocampal fissure hippocampal formation hippocampal RSA hippocampal theta activity hippocampal theta rhythm Hz RSA immobility input interneurons intracellular isocortex Kramis laminae learning lesions Leung lever pressing loops medial septal molecular layer monkey movement neurons nucleus occur orienting pathway phase relation phase reversal prefrontal cortex projection pyramidal cell layer pyramidal cells rabbits Ranck recorded representation rhythmic activity rhythmic bursts sensory septal region septo-hippocampal septum signals specific stimulation stratum radiatum studies subiculum superficial synaptic task theta activity theta driving theta frequency theta potentials theta response theta rhythm trials urethanized urethanized rat Vanderwolf Whishaw