Influence of local objects on hippocampal representations: Landmark vectors and memory

Deshmukh, Sachin S.; Knierim, James J.

doi:10.1002/hipo.22101

Cited by 218Memory and Neural MechanismsSpatial Cognition and NavigationNeurogenesis and neuroplasticity mechanisms

Influence of local objects on hippocampal representations: Landmark vectors and memory

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Deshmukh, Sachin S., Knierim, James J.·2013·Hippocampus

DOI 10.1002/hipo.22101PMC PMC3869706

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Abstract

The hippocampus is thought to represent nonspatial information in the context of spatial information. An animal can derive both spatial information as well as nonspatial information from the objects (landmarks) it encounters as it moves around in an environment. In this article, correlates of both object‐derived spatial as well as nonspatial information in the hippocampus of rats foraging in the presence of objects are demonstrated. A new form of CA1 place cells, called landmark‐vector cells, that encode spatial locations as a vector relationship to local landmarks is described. Such landmark vector relationships can be dynamically encoded. Of the 26 CA1 neurons that developed new fields in the course of a day's recording sessions, in eight cases, the new fields were located at a similar distance and direction from a landmark as the initial field was located relative to a different landmark. In addition, object‐location memory in the hippocampus is also described. When objects were removed from an environment or moved to new locations, a small number of neurons in CA1 and CA3 increased firing at the locations where the objects used to be. In some neurons, this increase occurred only in one location, indicating object + place conjunctive memory; in other neurons, the increase in firing was seen at multiple locations where an object used to be. Taken together, these results demonstrate that the spatially restricted firing of hippocampal neurons encode multiple types of information regarding the relationship between an animal's location and the location of objects in its environment. © 2013 Wiley Periodicals, Inc.

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CSCGs explain why place cells can be seen as encoding a vector relationship to local landmarks.
“CSCGs also explain why place cells can be seen as encoding a vector relationship to local landmarks (3).”
From Space is a latent sequence: A theory of the hippocampus (2024) · cites this paper as [3]
Many vectorial codes exist in mammalian navigation systems, including some in body-centric coordinates and others in world-centric coordinates.
“More generally, there are many vectorial codes in mammalian navigation systems1,2, including some in body-centric coordinates34,35, and others in world-centric coordinates34,36–38.”
From Transforming representations of movement from body- to world-centric space (2022) · cites this paper as [38]
The hippocampus encodes allocentric information of located objects.
“This suggests that the hippocampus encodes allocentric information of located objects, which is compatible with the findings of the landmark-vector properties of CA1 pyramidal neurons (Deshmukh and Knierim, 2013).”
From The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties (2020) · cites this paper as Deshmukh and Knierim, 2013
CA1 and CA3 pyramidal neurons code object information in location when the objects were spatially displaced.
“CA1 and CA3 pyramidal neurons were reported to code object information in location when the objects were spatially displaced (Deshmukh and Knierim, 2013; Manns and Eichenbaum, 2009).”
From The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties (2020) · cites this paper as Deshmukh and Knierim, 2013

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Authors: Deshmukh, S. S., & Knierim, J. J.
Affiliations: Johns Hopkins University (US)
Corresponding author: Deshmukh, Sachin S.
ORCID: Deshmukh, Sachin S.
Knierim, James J.
Venue: Hippocampus
Publisher: Wiley
Published: 2013-02-27
Volume: 23
Issue: 4
Pages: 253-267
ISSN: 1050-9631 (ISSN-L)
1098-1063
DOI: 10.1002/hipo.22101
PMC: PMC3869706
OpenAlex: W2115227909
Semantic Scholar: c0ece143364051769e54267ea0a7c57d8017517c
Cited by: 217
References: 56
Citations by year: 2026: 17 · 2025: 27 · 2024: 19 · 2023: 25 · 2022: 15 · 2021: 24 · 2020: 20 · 2019: 19 · 2018: 14 · 2017: 10 · 2016: 6 · 2015: 6 · 2014: 13 · 2013: 2
FWCI: 4.94
Type: journal article
Language: en
Open access: green
europepmc.org
Licence: onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations: Hippocampus (publishedVersion)
PubMed (publishedVersion)
Europe PMC (PubMed Central) (acceptedVersion)
PubMed Central (acceptedVersion)
Funders: National Institute of Neurological Disorders and Stroke (R01NS039456)
Topics: Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Physical Sciences › Engineering › Automotive Engineering › Spatial Cognition and Navigation
Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords: place cells, CA1, CA3, object location memory, spatial representation, dynamic encoding, rats, foraging
MeSH terms: Action Potentials, Animals, Brain Mapping, Conditioning, Operant, Cues, Discrimination, Psychological, Hippocampus, Male, Neurons, Orientation, Photic Stimulation, Space Perception, Head Movements, Rats, Long-Evans, Recognition, Psychology, Rats

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Influence of local objects on hippocampal representations: Landmark vectors and memory

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