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The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study
INTRODUCTION: Hippocampal oscillations have been regularly described as playing a dominant role in spatial memory and navigation in rodents. In humans, the relative role of anterior versus posterior rhythms during navigational memory is not established. METHODS: Here, we tested this hypothesis using...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2016
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036430/ https://www.ncbi.nlm.nih.gov/pubmed/27688937 http://dx.doi.org/10.1002/brb3.507 |
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author | Duarte, Isabel C. Castelhano, João Sales, Francisco Castelo‐Branco, Miguel |
author_facet | Duarte, Isabel C. Castelhano, João Sales, Francisco Castelo‐Branco, Miguel |
author_sort | Duarte, Isabel C. |
collection | PubMed |
description | INTRODUCTION: Hippocampal oscillations have been regularly described as playing a dominant role in spatial memory and navigation in rodents. In humans, the relative role of anterior versus posterior rhythms during navigational memory is not established. METHODS: Here, we tested this hypothesis using direct brain ECoG recordings in the anterior and posterior hippocampus of a patient, in a navigational task requiring spatial memory. We assessed multiple oscillatory bands during encoding and retrieval phases. RESULTS: We found navigation related 1–3.5 Hz activity during retrieval, both in the anterior and posterior hippocampus. Activity between 4 and 8 Hz was identified during both encoding and retrieval, only in the anterior hippocampus. CONCLUSIONS: Our findings are consistent with the view that an anterior/posterior functional gradient is present in the hippocampus, and involves two distinct neuronal networks, supporting either encoding or retrieval processes. Although this is a single case scenario, these findings suggest that neural oscillations during spatial navigation do vary across hippocampal subregions, as a function of encoding versus retrieval processes during the mnemonic process. In this single case study, the results point to the presence of a dual involvement of multiple frequency bands across hippocampal subregions during encoding and retrieval. Although these results need generalization, they provide a new perspective on distinct physiological properties of the anterior and posterior hippocampus in human spatial navigation during encoding and retrieval. |
format | Online Article Text |
id | pubmed-5036430 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
spelling | pubmed-50364302016-09-29 The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study Duarte, Isabel C. Castelhano, João Sales, Francisco Castelo‐Branco, Miguel Brain Behav Original Research INTRODUCTION: Hippocampal oscillations have been regularly described as playing a dominant role in spatial memory and navigation in rodents. In humans, the relative role of anterior versus posterior rhythms during navigational memory is not established. METHODS: Here, we tested this hypothesis using direct brain ECoG recordings in the anterior and posterior hippocampus of a patient, in a navigational task requiring spatial memory. We assessed multiple oscillatory bands during encoding and retrieval phases. RESULTS: We found navigation related 1–3.5 Hz activity during retrieval, both in the anterior and posterior hippocampus. Activity between 4 and 8 Hz was identified during both encoding and retrieval, only in the anterior hippocampus. CONCLUSIONS: Our findings are consistent with the view that an anterior/posterior functional gradient is present in the hippocampus, and involves two distinct neuronal networks, supporting either encoding or retrieval processes. Although this is a single case scenario, these findings suggest that neural oscillations during spatial navigation do vary across hippocampal subregions, as a function of encoding versus retrieval processes during the mnemonic process. In this single case study, the results point to the presence of a dual involvement of multiple frequency bands across hippocampal subregions during encoding and retrieval. Although these results need generalization, they provide a new perspective on distinct physiological properties of the anterior and posterior hippocampus in human spatial navigation during encoding and retrieval. John Wiley and Sons Inc. 2016-06-27 /pmc/articles/PMC5036430/ /pubmed/27688937 http://dx.doi.org/10.1002/brb3.507 Text en © 2016 The Authors. Brain and Behavior published by Wiley Periodicals, Inc. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Research Duarte, Isabel C. Castelhano, João Sales, Francisco Castelo‐Branco, Miguel The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title | The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title_full | The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title_fullStr | The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title_full_unstemmed | The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title_short | The anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
title_sort | anterior versus posterior hippocampal oscillations debate in human spatial navigation: evidence from an electrocorticographic case study |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036430/ https://www.ncbi.nlm.nih.gov/pubmed/27688937 http://dx.doi.org/10.1002/brb3.507 |
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