MEG and EEG topography of frontal midline theta rhythm and source localization

Keiji Iramina, Shoogo Ueno, Shigeaki Matsuoka

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

In this paper, we report on our study of frontal midline theta (Fmθ) activity in human subjects, recorded during mental processes such as arithmetic calculation. The Fmθ is a 6-7 Hz rhythmic wave with a duration of few seconds. The Fmθ activity is observed in the central region at the front of the head. EEGs and MEGs of Fmθ were measured simultaneously during mental calculation, and we analyzed these waveforms based on both topographic EEG maps and magnetic fields measurements. A single dipole simulated the EEG topography adequately, but there are many other dipole models which can generate a similar EEG pattern. It is difficult to estimate the source location of the Fmθ from the EEG topography alone because the EEG technique has a certain ambiguity associated with source estimation. Therefore, we considered the spatial relationships between the sources and the patterns of EEG and MEG that were simulated. Although it is not possible to obtain a unique solution for the source location of Fmθ from the EEG data alone, the simultaneous recording of MEGs from a large scalp area may result in an unambiguous solution. We therefore conclude that the simultaneous recording of both MEG and EEG data is more useful for accurate localization, than the EEG alone.

Original languageEnglish
Pages (from-to)329-331
Number of pages3
JournalBrain Topography
Volume8
Issue number3
DOIs
Publication statusPublished - May 24 1996

Fingerprint

Theta Rhythm
Electroencephalography
Mental Processes
Magnetic Fields
Scalp
Human Activities
Head

All Science Journal Classification (ASJC) codes

  • Clinical Neurology
  • Neuroscience(all)

Cite this

MEG and EEG topography of frontal midline theta rhythm and source localization. / Iramina, Keiji; Ueno, Shoogo; Matsuoka, Shigeaki.

In: Brain Topography, Vol. 8, No. 3, 24.05.1996, p. 329-331.

Research output: Contribution to journalArticle

Iramina, Keiji ; Ueno, Shoogo ; Matsuoka, Shigeaki. / MEG and EEG topography of frontal midline theta rhythm and source localization. In: Brain Topography. 1996 ; Vol. 8, No. 3. pp. 329-331.
@article{fd4caa4d9edb4d02b6479cd7aaa98d70,
title = "MEG and EEG topography of frontal midline theta rhythm and source localization",
abstract = "In this paper, we report on our study of frontal midline theta (Fmθ) activity in human subjects, recorded during mental processes such as arithmetic calculation. The Fmθ is a 6-7 Hz rhythmic wave with a duration of few seconds. The Fmθ activity is observed in the central region at the front of the head. EEGs and MEGs of Fmθ were measured simultaneously during mental calculation, and we analyzed these waveforms based on both topographic EEG maps and magnetic fields measurements. A single dipole simulated the EEG topography adequately, but there are many other dipole models which can generate a similar EEG pattern. It is difficult to estimate the source location of the Fmθ from the EEG topography alone because the EEG technique has a certain ambiguity associated with source estimation. Therefore, we considered the spatial relationships between the sources and the patterns of EEG and MEG that were simulated. Although it is not possible to obtain a unique solution for the source location of Fmθ from the EEG data alone, the simultaneous recording of MEGs from a large scalp area may result in an unambiguous solution. We therefore conclude that the simultaneous recording of both MEG and EEG data is more useful for accurate localization, than the EEG alone.",
author = "Keiji Iramina and Shoogo Ueno and Shigeaki Matsuoka",
year = "1996",
month = "5",
day = "24",
doi = "10.1007/BF01184793",
language = "English",
volume = "8",
pages = "329--331",
journal = "Brain Topography",
issn = "0896-0267",
publisher = "Kluwer Academic/Human Sciences Press Inc.",
number = "3",

}

TY - JOUR

T1 - MEG and EEG topography of frontal midline theta rhythm and source localization

AU - Iramina, Keiji

AU - Ueno, Shoogo

AU - Matsuoka, Shigeaki

PY - 1996/5/24

Y1 - 1996/5/24

N2 - In this paper, we report on our study of frontal midline theta (Fmθ) activity in human subjects, recorded during mental processes such as arithmetic calculation. The Fmθ is a 6-7 Hz rhythmic wave with a duration of few seconds. The Fmθ activity is observed in the central region at the front of the head. EEGs and MEGs of Fmθ were measured simultaneously during mental calculation, and we analyzed these waveforms based on both topographic EEG maps and magnetic fields measurements. A single dipole simulated the EEG topography adequately, but there are many other dipole models which can generate a similar EEG pattern. It is difficult to estimate the source location of the Fmθ from the EEG topography alone because the EEG technique has a certain ambiguity associated with source estimation. Therefore, we considered the spatial relationships between the sources and the patterns of EEG and MEG that were simulated. Although it is not possible to obtain a unique solution for the source location of Fmθ from the EEG data alone, the simultaneous recording of MEGs from a large scalp area may result in an unambiguous solution. We therefore conclude that the simultaneous recording of both MEG and EEG data is more useful for accurate localization, than the EEG alone.

AB - In this paper, we report on our study of frontal midline theta (Fmθ) activity in human subjects, recorded during mental processes such as arithmetic calculation. The Fmθ is a 6-7 Hz rhythmic wave with a duration of few seconds. The Fmθ activity is observed in the central region at the front of the head. EEGs and MEGs of Fmθ were measured simultaneously during mental calculation, and we analyzed these waveforms based on both topographic EEG maps and magnetic fields measurements. A single dipole simulated the EEG topography adequately, but there are many other dipole models which can generate a similar EEG pattern. It is difficult to estimate the source location of the Fmθ from the EEG topography alone because the EEG technique has a certain ambiguity associated with source estimation. Therefore, we considered the spatial relationships between the sources and the patterns of EEG and MEG that were simulated. Although it is not possible to obtain a unique solution for the source location of Fmθ from the EEG data alone, the simultaneous recording of MEGs from a large scalp area may result in an unambiguous solution. We therefore conclude that the simultaneous recording of both MEG and EEG data is more useful for accurate localization, than the EEG alone.

UR - http://www.scopus.com/inward/record.url?scp=0029967428&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029967428&partnerID=8YFLogxK

U2 - 10.1007/BF01184793

DO - 10.1007/BF01184793

M3 - Article

C2 - 8728427

AN - SCOPUS:0029967428

VL - 8

SP - 329

EP - 331

JO - Brain Topography

JF - Brain Topography

SN - 0896-0267

IS - 3

ER -