Emergence of orthogonal hippocampal representations during spatial learning

TL;DR

The study shows how hippocampal neurons in mice develop distinct patterns as they learn spatial tasks.

Contribution

The paper introduces the concept of orthogonalized ensemble codes in hippocampal representations during spatial learning.

Findings

Hippocampal neurons show progressive changes during spatial learning.

Orthogonalized codes emerge to represent task structure and discrimination outcomes.

Abstract

Sun et al. (2025) reveal the progressive, dynamic changes in the response properties of thousands of hippocampal neurons as mice learn a conditional discrimination while moving along a virtual linear track. At the end of training, separate orthogonalized ensemble codes, reflecting the properties of a state machine, capture the inherent structure of the task while dissociating the discrimination outcomes.