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Assaying Circuit Specific Regulation of Adult Hippocampal Neural Precursor Cells

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Published on: July 24, 2019

Angular and linear speed cells in the parahippocampal circuits.

Davide Spalla¹, Alessandro Treves¹, Charlotte N Boccara²

¹Sissa, Via Bonomea 265, 34136, Trieste, Italy.

Nature Communications

|April 8, 2022

Summary

Researchers identified neurons encoding self-motion speed in the brain

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Area of Science:

Neuroscience
Computational Neuroscience
Cognitive Neuroscience

Background:

The hippocampal region integrates information for spatial representation.
Continuous attractor network (CAN) models propose self-motion signals update these representations.
Data on conjunctive coding of self-motion and spatial correlates are scarce.

Purpose of the Study:

To investigate neurons encoding self-motion velocity in the hippocampal formation.
To determine if these neurons conjunctively encode position and/or direction.
To explore the role of self-motion signals in updating spatial representations.

Main Methods:

Electrophysiological recordings in rodents.
Analysis of neuronal firing rates in relation to movement.
Mapping of neuronal properties across different hippocampal subfields.

Main Results:

Neurons encoding angular and linear velocity were found across the medial entorhinal cortex (MEC), presubiculum, and parasubiculum.
These self-motion neurons often co-encoded position and/or direction.
No structured organization was observed for these conjunctive self-motion neurons, except in MEC layer II.

Conclusions:

Self-motion neurons contribute to updating spatial representations.
Linear and angular speed may provide a generalized algorithm for updating representations.
Findings offer insights into the neural mechanisms of spatial cognition and representation updating.