Gated transformations from egocentric to allocentric reference frames involving retrosplenial cortex, entorhinal cortex, and hippocampus

Mar 2, 2023Hippocampus

Brain processes that switch from self-centered to world-centered spatial views involving memory and navigation areas

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Abstract

Neurons in behaving rodents demonstrate egocentric coding related to their environment.

Neurons in the retrosplenial cortex are involved in coding the position of boundaries based on the animal's perspective.
The transformation from egocentric to allocentric coordinates may involve new models of phase coding.
These neuronal responses could support hierarchical representations of complex scenes.
Findings in rodents are compared to coordinate transformation studies in humans and non-human primates.

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This paper reviews the recent experimental finding that neurons in behaving rodents show egocentric coding of the environment in a number of structures associated with the hippocampus. Many animals generating behavior on the basis of sensory input must deal with the transformation of coordinates from the egocentric position of sensory input relative to the animal, into an allocentric framework concerning the position of multiple goals and objects relative to each other in the environment. Neurons in retrosplenial cortex show egocentric coding of the position of boundaries in relation to an animal. These neuronal responses are discussed in relation to existing models of the transformation from egocentric to allocentric coordinates using gain fields and a new model proposing transformations of phase coding that differ from current models. The same type of transformations could allow hierarchical representations of complex scenes. The responses in rodents are also discussed in comparison to work on coordinate transformations in humans and non-human primates.

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