Hippocampal spatial view cells for memory and navigation, and their underlying connectivity in humans. 2023

Edmund T Rolls
Oxford Centre for Computational Neuroscience, Oxford, UK.

Hippocampal and parahippocampal gyrus spatial view neurons in primates respond to the spatial location being looked at. The representation is allocentric, in that the responses are to locations "out there" in the world, and are relatively invariant with respect to retinal position, eye position, head direction, and the place where the individual is located. The underlying connectivity in humans is from ventromedial visual cortical regions to the parahippocampal scene area, leading to the theory that spatial view cells are formed by combinations of overlapping feature inputs self-organized based on their closeness in space. Thus, although spatial view cells represent "where" for episodic memory and navigation, they are formed by ventral visual stream feature inputs in the parahippocampal gyrus in what is the parahippocampal scene area. A second "where" driver of spatial view cells are parietal inputs, which it is proposed provide the idiothetic update for spatial view cells, used for memory recall and navigation when the spatial view details are obscured. Inferior temporal object "what" inputs and orbitofrontal cortex reward inputs connect to the human hippocampal system, and in macaques can be associated in the hippocampus with spatial view cell "where" representations to implement episodic memory. Hippocampal spatial view cells also provide a basis for navigation to a series of viewed landmarks, with the orbitofrontal cortex reward inputs to the hippocampus providing the goals for navigation, which can then be implemented by hippocampal connectivity in humans to parietal cortex regions involved in visuomotor actions in space. The presence of foveate vision and the highly developed temporal lobe for object and scene processing in primates including humans provide a basis for hippocampal spatial view cells to be key to understanding episodic memory in the primate and human hippocampus, and the roles of this system in primate including human navigation.

UI MeSH Term Description Entries
D009474 Neurons The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM. Nerve Cells,Cell, Nerve,Cells, Nerve,Nerve Cell,Neuron
D011323 Primates An order of mammals consisting of more than 300 species that include LEMURS; LORISIDAE; TARSIERS; MONKEYS; and HOMINIDS. They are characterized by a relatively large brain when compared with other terrestrial mammals, forward-facing eyes, the presence of a CALCARINE SULCUS, and specialized MECHANORECEPTORS in the hands and feet which allow the perception of light touch. Primate
D006624 Hippocampus A curved elevation of GRAY MATTER extending the entire length of the floor of the TEMPORAL HORN of the LATERAL VENTRICLE (see also TEMPORAL LOBE). The hippocampus proper, subiculum, and DENTATE GYRUS constitute the hippocampal formation. Sometimes authors include the ENTORHINAL CORTEX in the hippocampal formation. Ammon Horn,Cornu Ammonis,Hippocampal Formation,Subiculum,Ammon's Horn,Hippocampus Proper,Ammons Horn,Formation, Hippocampal,Formations, Hippocampal,Hippocampal Formations,Hippocampus Propers,Horn, Ammon,Horn, Ammon's,Proper, Hippocampus,Propers, Hippocampus,Subiculums
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D061212 Memory, Episodic Type of declarative memory, consisting of personal memory in contrast to general knowledge. Episodic Memory,Autobiographical Memory,Memory, Prospective,Prospective Memory,Autobiographical Memories,Episodic Memories,Memories, Autobiographical,Memories, Episodic,Memories, Prospective,Memory, Autobiographical,Prospective Memories
D020534 Parahippocampal Gyrus A convolution on the inferior surface of each cerebral hemisphere, lying between the hippocampal and collateral sulci. Brodmann Area 27,Brodmann Area 48,Brodmann's Area 27,Brodmann's Area 48,Gyrus Hippocampi,Gyrus Parahippocampalis,Hippocampal Gyrus,Hippocampal Gyri,Parahippocampal Gyri,Posterior Parahippocampal Gyri,Posterior Parahippocampal Gyrus,Presubiculum,Uncus of Parahippocampal Gyrus,Uncus, Parahippocampal Gyrus,Area 27, Brodmann,Area 27, Brodmann's,Area 48, Brodmann,Area 48, Brodmann's,Brodmanns Area 27,Brodmanns Area 48,Gyrus Hippocampus,Gyrus, Hippocampal,Gyrus, Parahippocampal,Gyrus, Posterior Parahippocampal,Parahippocampal Gyrus Uncus,Parahippocampalis, Gyrus,Presubiculums
D065854 Spatial Navigation Process by which organisms use various cues to develop a route to a destination and their ability to travel such a planned route. Spatial Ability,Spatial Visualization,Abilities, Spatial,Ability, Spatial,Navigation, Spatial,Navigations, Spatial,Spatial Abilities,Spatial Navigations,Spatial Visualizations,Visualization, Spatial,Visualizations, Spatial

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