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Processing time affects sequential memory performance beginning at the level of visual encoding

Electrophysiological studies have demonstrated that theta-band activity is useful for investigating neural mechanisms of memory. However, mechanisms specifically driving memory performance remain poorly understood. In sequential memory, performance can be artificially attenuated by shortening the in...

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Autores principales: Takase, Ryoken, Boasen, Jared, Kuriki, Shinya, Toyomura, Akira, Yokosawa, Koichi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8942227/
https://www.ncbi.nlm.nih.gov/pubmed/35320312
http://dx.doi.org/10.1371/journal.pone.0265719
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author Takase, Ryoken
Boasen, Jared
Kuriki, Shinya
Toyomura, Akira
Yokosawa, Koichi
author_facet Takase, Ryoken
Boasen, Jared
Kuriki, Shinya
Toyomura, Akira
Yokosawa, Koichi
author_sort Takase, Ryoken
collection PubMed
description Electrophysiological studies have demonstrated that theta-band activity is useful for investigating neural mechanisms of memory. However, mechanisms specifically driving memory performance remain poorly understood. In sequential memory, performance can be artificially attenuated by shortening the inter-stimulus interval (ISI) between memory item presentations. Therefore, we sought to clarify the mechanisms of sequential memory performance by analyzing theta-band (4–8 Hz) activity recorded via magnetoencephalogram in 33 participants during performance of a sequential memory task where memory items were presented at either slow or fast rates in accordance with longer or shorter ISIs, respectively. Particularly in the slow task, theta activity clearly modulated in accordance with the presentation of memory items. Common cortical target regions in the occipital and frontal cortex were identified in both tasks and related to visual encoding and memory maintenance, respectively. Compared to the slow task, occipital-theta activity was significantly lower in the fast task from the midterm until the ending of encoding, in correspondence with significantly lower recall for memory items in this same period. Meanwhile, despite a loss of clarity in responsiveness to individual memory items in the fast task, frontal-theta activity was not different between tasks and exhibited particularly strong responses in both tasks during the holding period prior to recall. Our results indicate that shorter processing time erodes sequential memory performance beginning at the level of visual encoding.
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spelling pubmed-89422272022-03-24 Processing time affects sequential memory performance beginning at the level of visual encoding Takase, Ryoken Boasen, Jared Kuriki, Shinya Toyomura, Akira Yokosawa, Koichi PLoS One Research Article Electrophysiological studies have demonstrated that theta-band activity is useful for investigating neural mechanisms of memory. However, mechanisms specifically driving memory performance remain poorly understood. In sequential memory, performance can be artificially attenuated by shortening the inter-stimulus interval (ISI) between memory item presentations. Therefore, we sought to clarify the mechanisms of sequential memory performance by analyzing theta-band (4–8 Hz) activity recorded via magnetoencephalogram in 33 participants during performance of a sequential memory task where memory items were presented at either slow or fast rates in accordance with longer or shorter ISIs, respectively. Particularly in the slow task, theta activity clearly modulated in accordance with the presentation of memory items. Common cortical target regions in the occipital and frontal cortex were identified in both tasks and related to visual encoding and memory maintenance, respectively. Compared to the slow task, occipital-theta activity was significantly lower in the fast task from the midterm until the ending of encoding, in correspondence with significantly lower recall for memory items in this same period. Meanwhile, despite a loss of clarity in responsiveness to individual memory items in the fast task, frontal-theta activity was not different between tasks and exhibited particularly strong responses in both tasks during the holding period prior to recall. Our results indicate that shorter processing time erodes sequential memory performance beginning at the level of visual encoding. Public Library of Science 2022-03-23 /pmc/articles/PMC8942227/ /pubmed/35320312 http://dx.doi.org/10.1371/journal.pone.0265719 Text en © 2022 Takase et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Takase, Ryoken
Boasen, Jared
Kuriki, Shinya
Toyomura, Akira
Yokosawa, Koichi
Processing time affects sequential memory performance beginning at the level of visual encoding
title Processing time affects sequential memory performance beginning at the level of visual encoding
title_full Processing time affects sequential memory performance beginning at the level of visual encoding
title_fullStr Processing time affects sequential memory performance beginning at the level of visual encoding
title_full_unstemmed Processing time affects sequential memory performance beginning at the level of visual encoding
title_short Processing time affects sequential memory performance beginning at the level of visual encoding
title_sort processing time affects sequential memory performance beginning at the level of visual encoding
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8942227/
https://www.ncbi.nlm.nih.gov/pubmed/35320312
http://dx.doi.org/10.1371/journal.pone.0265719
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