Theta-alpha EEG phase distributions in the frontal area for dissociation of visual and auditory working memory

Masakazu Akiyama, Atsushi Tero, Masahiro Kawasaki, Yasumasa Nishiura, Yoko Yamaguchi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Working memory (WM) is known to be associated with synchronization of the theta and alpha bands observed in electroencephalograms (EEGs). Although frontal-posterior global theta synchronization appears in modality-specific WM, local theta synchronization in frontal regions has been found in modality-independent WM. How frontal theta oscillations separately synchronize with task-relevant sensory brain areas remains an open question. Here, we focused on theta-alpha phase relationships in frontal areas using EEG, and then verified their functional roles with mathematical models. EEG data showed that the relationship between theta (6 Hz) and alpha (12 Hz) phases in the frontal areas was about 1:2 during both auditory and visual WM, and that the phase distributions between auditory and visual WM were different. Next, we used the differences in phase distributions to construct FitzHugh-Nagumo type mathematical models. The results replicated the modality-specific branching by orthogonally of the trigonometric functions for theta and alpha oscillations. Furthermore, mathematical and experimental results were consistent with regards to the phase relationships and amplitudes observed in frontal and sensory areas. These results indicate the important role that different phase distributions of theta and alpha oscillations have in modality-specific dissociation in the brain.

Original languageEnglish
Article number42776
JournalScientific reports
Volume7
DOIs
Publication statusPublished - Mar 7 2017

Fingerprint

Short-Term Memory
Electroencephalography
Theoretical Models
Brain

All Science Journal Classification (ASJC) codes

  • General

Cite this

Theta-alpha EEG phase distributions in the frontal area for dissociation of visual and auditory working memory. / Akiyama, Masakazu; Tero, Atsushi; Kawasaki, Masahiro; Nishiura, Yasumasa; Yamaguchi, Yoko.

In: Scientific reports, Vol. 7, 42776, 07.03.2017.

Research output: Contribution to journalArticle

Akiyama, Masakazu ; Tero, Atsushi ; Kawasaki, Masahiro ; Nishiura, Yasumasa ; Yamaguchi, Yoko. / Theta-alpha EEG phase distributions in the frontal area for dissociation of visual and auditory working memory. In: Scientific reports. 2017 ; Vol. 7.
@article{9ba4f9f1e5854c01a3a0cbe5f62899fc,
title = "Theta-alpha EEG phase distributions in the frontal area for dissociation of visual and auditory working memory",
abstract = "Working memory (WM) is known to be associated with synchronization of the theta and alpha bands observed in electroencephalograms (EEGs). Although frontal-posterior global theta synchronization appears in modality-specific WM, local theta synchronization in frontal regions has been found in modality-independent WM. How frontal theta oscillations separately synchronize with task-relevant sensory brain areas remains an open question. Here, we focused on theta-alpha phase relationships in frontal areas using EEG, and then verified their functional roles with mathematical models. EEG data showed that the relationship between theta (6 Hz) and alpha (12 Hz) phases in the frontal areas was about 1:2 during both auditory and visual WM, and that the phase distributions between auditory and visual WM were different. Next, we used the differences in phase distributions to construct FitzHugh-Nagumo type mathematical models. The results replicated the modality-specific branching by orthogonally of the trigonometric functions for theta and alpha oscillations. Furthermore, mathematical and experimental results were consistent with regards to the phase relationships and amplitudes observed in frontal and sensory areas. These results indicate the important role that different phase distributions of theta and alpha oscillations have in modality-specific dissociation in the brain.",
author = "Masakazu Akiyama and Atsushi Tero and Masahiro Kawasaki and Yasumasa Nishiura and Yoko Yamaguchi",
year = "2017",
month = "3",
day = "7",
doi = "10.1038/srep42776",
language = "English",
volume = "7",
journal = "Scientific Reports",
issn = "2045-2322",
publisher = "Nature Publishing Group",

}

TY - JOUR

T1 - Theta-alpha EEG phase distributions in the frontal area for dissociation of visual and auditory working memory

AU - Akiyama, Masakazu

AU - Tero, Atsushi

AU - Kawasaki, Masahiro

AU - Nishiura, Yasumasa

AU - Yamaguchi, Yoko

PY - 2017/3/7

Y1 - 2017/3/7

N2 - Working memory (WM) is known to be associated with synchronization of the theta and alpha bands observed in electroencephalograms (EEGs). Although frontal-posterior global theta synchronization appears in modality-specific WM, local theta synchronization in frontal regions has been found in modality-independent WM. How frontal theta oscillations separately synchronize with task-relevant sensory brain areas remains an open question. Here, we focused on theta-alpha phase relationships in frontal areas using EEG, and then verified their functional roles with mathematical models. EEG data showed that the relationship between theta (6 Hz) and alpha (12 Hz) phases in the frontal areas was about 1:2 during both auditory and visual WM, and that the phase distributions between auditory and visual WM were different. Next, we used the differences in phase distributions to construct FitzHugh-Nagumo type mathematical models. The results replicated the modality-specific branching by orthogonally of the trigonometric functions for theta and alpha oscillations. Furthermore, mathematical and experimental results were consistent with regards to the phase relationships and amplitudes observed in frontal and sensory areas. These results indicate the important role that different phase distributions of theta and alpha oscillations have in modality-specific dissociation in the brain.

AB - Working memory (WM) is known to be associated with synchronization of the theta and alpha bands observed in electroencephalograms (EEGs). Although frontal-posterior global theta synchronization appears in modality-specific WM, local theta synchronization in frontal regions has been found in modality-independent WM. How frontal theta oscillations separately synchronize with task-relevant sensory brain areas remains an open question. Here, we focused on theta-alpha phase relationships in frontal areas using EEG, and then verified their functional roles with mathematical models. EEG data showed that the relationship between theta (6 Hz) and alpha (12 Hz) phases in the frontal areas was about 1:2 during both auditory and visual WM, and that the phase distributions between auditory and visual WM were different. Next, we used the differences in phase distributions to construct FitzHugh-Nagumo type mathematical models. The results replicated the modality-specific branching by orthogonally of the trigonometric functions for theta and alpha oscillations. Furthermore, mathematical and experimental results were consistent with regards to the phase relationships and amplitudes observed in frontal and sensory areas. These results indicate the important role that different phase distributions of theta and alpha oscillations have in modality-specific dissociation in the brain.

UR - http://www.scopus.com/inward/record.url?scp=85014741890&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85014741890&partnerID=8YFLogxK

U2 - 10.1038/srep42776

DO - 10.1038/srep42776

M3 - Article

C2 - 28266595

AN - SCOPUS:85014741890

VL - 7

JO - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 42776

ER -