Changes in gamma-band power and phase synchronization with the difficulty of a visual oddball task

Kyunghwan Kim, Jin Yoon, Ja Hyun Kim, Ki Young Jung

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We examined local and global differences in neuronal association patterns due to task difficulty. Induced and evoked gamma-band activity (GBA) was investigated using electroencephalograms recorded during visual oddball tasks of two difficulty levels. Significant phase synchronization (PS) in the gamma-band was determined by a double-threshold strategy, devised to detect prominent increases with respect to prestimulus baseline and surrogate data. A considerable increase in the early evoked GBA was observed for both difficulties, and this tended to be delayed for the hard task. Induced GBA was increased at the P300 latency period, but no difficulty-related change was observed. Intense PS among anterior and posterior regions along the midline was observed in a 30-38 Hz band, which was enhanced in the easy task throughout task execution, although the overall pattern of connectivity was similar for both difficulties. This may be the underlying basis of the faster and more accurate response to the easy task. The results showed that the most apparent change in the gamma-band associated with difficulty was observed in the PS pattern, not in the spectral power itself. This may imply that the difficulty-related change in cortical information processing was implemented as a change in the spatiotemporal pattern of interregional connectivity.

Original languageEnglish
Pages (from-to)105-112
Number of pages8
JournalBrain Research
Volume1236
DOIs
Publication statusPublished - 2008 Oct 21

Fingerprint

Automatic Data Processing
Electroencephalography

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

Cite this

Kim, Kyunghwan ; Yoon, Jin ; Kim, Ja Hyun ; Jung, Ki Young. / Changes in gamma-band power and phase synchronization with the difficulty of a visual oddball task. In: Brain Research. 2008 ; Vol. 1236. pp. 105-112.
@article{9e15239e5d9c4a51858075bb5a6b4862,
title = "Changes in gamma-band power and phase synchronization with the difficulty of a visual oddball task",
abstract = "We examined local and global differences in neuronal association patterns due to task difficulty. Induced and evoked gamma-band activity (GBA) was investigated using electroencephalograms recorded during visual oddball tasks of two difficulty levels. Significant phase synchronization (PS) in the gamma-band was determined by a double-threshold strategy, devised to detect prominent increases with respect to prestimulus baseline and surrogate data. A considerable increase in the early evoked GBA was observed for both difficulties, and this tended to be delayed for the hard task. Induced GBA was increased at the P300 latency period, but no difficulty-related change was observed. Intense PS among anterior and posterior regions along the midline was observed in a 30-38 Hz band, which was enhanced in the easy task throughout task execution, although the overall pattern of connectivity was similar for both difficulties. This may be the underlying basis of the faster and more accurate response to the easy task. The results showed that the most apparent change in the gamma-band associated with difficulty was observed in the PS pattern, not in the spectral power itself. This may imply that the difficulty-related change in cortical information processing was implemented as a change in the spatiotemporal pattern of interregional connectivity.",
author = "Kyunghwan Kim and Jin Yoon and Kim, {Ja Hyun} and Jung, {Ki Young}",
year = "2008",
month = "10",
day = "21",
doi = "10.1016/j.brainres.2008.07.118",
language = "English",
volume = "1236",
pages = "105--112",
journal = "Brain Research",
issn = "0006-8993",
publisher = "Elsevier",

}

Changes in gamma-band power and phase synchronization with the difficulty of a visual oddball task. / Kim, Kyunghwan; Yoon, Jin; Kim, Ja Hyun; Jung, Ki Young.

In: Brain Research, Vol. 1236, 21.10.2008, p. 105-112.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Changes in gamma-band power and phase synchronization with the difficulty of a visual oddball task

AU - Kim, Kyunghwan

AU - Yoon, Jin

AU - Kim, Ja Hyun

AU - Jung, Ki Young

PY - 2008/10/21

Y1 - 2008/10/21

N2 - We examined local and global differences in neuronal association patterns due to task difficulty. Induced and evoked gamma-band activity (GBA) was investigated using electroencephalograms recorded during visual oddball tasks of two difficulty levels. Significant phase synchronization (PS) in the gamma-band was determined by a double-threshold strategy, devised to detect prominent increases with respect to prestimulus baseline and surrogate data. A considerable increase in the early evoked GBA was observed for both difficulties, and this tended to be delayed for the hard task. Induced GBA was increased at the P300 latency period, but no difficulty-related change was observed. Intense PS among anterior and posterior regions along the midline was observed in a 30-38 Hz band, which was enhanced in the easy task throughout task execution, although the overall pattern of connectivity was similar for both difficulties. This may be the underlying basis of the faster and more accurate response to the easy task. The results showed that the most apparent change in the gamma-band associated with difficulty was observed in the PS pattern, not in the spectral power itself. This may imply that the difficulty-related change in cortical information processing was implemented as a change in the spatiotemporal pattern of interregional connectivity.

AB - We examined local and global differences in neuronal association patterns due to task difficulty. Induced and evoked gamma-band activity (GBA) was investigated using electroencephalograms recorded during visual oddball tasks of two difficulty levels. Significant phase synchronization (PS) in the gamma-band was determined by a double-threshold strategy, devised to detect prominent increases with respect to prestimulus baseline and surrogate data. A considerable increase in the early evoked GBA was observed for both difficulties, and this tended to be delayed for the hard task. Induced GBA was increased at the P300 latency period, but no difficulty-related change was observed. Intense PS among anterior and posterior regions along the midline was observed in a 30-38 Hz band, which was enhanced in the easy task throughout task execution, although the overall pattern of connectivity was similar for both difficulties. This may be the underlying basis of the faster and more accurate response to the easy task. The results showed that the most apparent change in the gamma-band associated with difficulty was observed in the PS pattern, not in the spectral power itself. This may imply that the difficulty-related change in cortical information processing was implemented as a change in the spatiotemporal pattern of interregional connectivity.

UR - http://www.scopus.com/inward/record.url?scp=53249147135&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53249147135&partnerID=8YFLogxK

U2 - 10.1016/j.brainres.2008.07.118

DO - 10.1016/j.brainres.2008.07.118

M3 - Article

VL - 1236

SP - 105

EP - 112

JO - Brain Research

JF - Brain Research

SN - 0006-8993

ER -