Buzsáki György
- Published in print:
- 2006
- Published Online:
- May 2009
- ISBN:
- 9780195301069
- eISBN:
- 9780199863716
- Item type:
- chapter
- Publisher:
- Oxford University Press
- DOI:
- 10.1093/acprof:oso/9780195301069.003.0011
- Subject:
- Neuroscience, Neuroendocrine and Autonomic, Techniques
The hippocampus and associated structures are organized in multiple loops, with reciprocal connections to the neocortex. The most prominent collective pattern of hippocampal neurons is theta ...
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The hippocampus and associated structures are organized in multiple loops, with reciprocal connections to the neocortex. The most prominent collective pattern of hippocampal neurons is theta oscillation. In one-dimensional tasks, pyramidal cells fire maximally at particular positions, signifying the place field center. The assembly members that define the current location also contribute spikes to the representation of past and future positions in multiple theta cycles. Similarly, positional “distances” among items of an episodic list can be coded by the synaptic strengths between the cell assemblies. In two-dimensional environments, exploration leads to crossing the same positions from different directions. These junctions serve to establish a map and subsequent landmark (map-based) navigation. The hallmark of the cognitive map is the presence of omnidirectional place cells in the hippocampus and tessellating “grid cells” in the entorhinal cortex. Neuron members of an omnidirectional or explicit assembly collectively define or symbolize the semantic “meaning” of an item.Less
The hippocampus and associated structures are organized in multiple loops, with reciprocal connections to the neocortex. The most prominent collective pattern of hippocampal neurons is theta oscillation. In one-dimensional tasks, pyramidal cells fire maximally at particular positions, signifying the place field center. The assembly members that define the current location also contribute spikes to the representation of past and future positions in multiple theta cycles. Similarly, positional “distances” among items of an episodic list can be coded by the synaptic strengths between the cell assemblies. In two-dimensional environments, exploration leads to crossing the same positions from different directions. These junctions serve to establish a map and subsequent landmark (map-based) navigation. The hallmark of the cognitive map is the presence of omnidirectional place cells in the hippocampus and tessellating “grid cells” in the entorhinal cortex. Neuron members of an omnidirectional or explicit assembly collectively define or symbolize the semantic “meaning” of an item.
A. David Redish
- Published in print:
- 2012
- Published Online:
- May 2016
- ISBN:
- 9780262018098
- eISBN:
- 9780262306003
- Item type:
- chapter
- Publisher:
- The MIT Press
- DOI:
- 10.7551/mitpress/9780262018098.003.0006
- Subject:
- Sociology, Social Psychology and Interaction
Deliberation entails the sequential, serial search through possible options. This means that deliberation requires a mechanism to represent the structure of the world, from which predictions can be ...
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Deliberation entails the sequential, serial search through possible options. This means that deliberation requires a mechanism to represent the structure of the world, from which predictions can be generated concerning these options and the expectations of the consequences of taking those options. Deliberation requires a mechanism to move mentally through those predictions as well as a mechanism to evaluate and compare those predictions. Neural signals for each of these factors have been found in the rat.Less
Deliberation entails the sequential, serial search through possible options. This means that deliberation requires a mechanism to represent the structure of the world, from which predictions can be generated concerning these options and the expectations of the consequences of taking those options. Deliberation requires a mechanism to move mentally through those predictions as well as a mechanism to evaluate and compare those predictions. Neural signals for each of these factors have been found in the rat.
