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Human cortical traveling waves: dynamical properties and correlations with responses.

Patten TM, Rennie CJ, Robinson PA, Gong P - PLoS ONE (2012)

Bottom Line: The spatiotemporal behavior of human EEG oscillations is investigated.Traveling waves in the alpha and theta ranges are found to be common in both prestimulus and poststimulus EEG activity.The dynamical properties of these waves, including their speeds, directions, and durations, are systematically characterized for the first time, and the results show that there are significant changes of prestimulus spontaneous waves in the presence of an external stimulus.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, University of Sydney, Sydney, New South Wales, Australia.

ABSTRACT
The spatiotemporal behavior of human EEG oscillations is investigated. Traveling waves in the alpha and theta ranges are found to be common in both prestimulus and poststimulus EEG activity. The dynamical properties of these waves, including their speeds, directions, and durations, are systematically characterized for the first time, and the results show that there are significant changes of prestimulus spontaneous waves in the presence of an external stimulus. Furthermore, the functional relevance of these waves is examined by studying how they are correlated with reaction times on a single trial basis; prestimulus alpha waves traveling in the frontal-to-occipital direction are found to be most correlated to reaction speeds. These findings suggest that propagating waves of brain oscillations might be involved in mediating long-range interactions between widely distributed parts of human cortex.

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Histograms of the durations and speeds of prestimulus and poststimulus theta waves measured for all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of poststimulus waves.
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pone-0038392-g008: Histograms of the durations and speeds of prestimulus and poststimulus theta waves measured for all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of poststimulus waves.

Mentions: A similar analysis was then performed for the theta waves. Figure 8 shows histograms of the average durations and speeds of the theta waves for all trials and subjects during the epochs, 500 ms before and 500 ms after stimulus onset. As summarized in Table 1, the average durations of the prestimulus and poststimulus theta waves across trials and subjects were 84 ms (SD = 12 ms) and 112 ms (SD = 18 ms) respectively, and the difference between the two intervals was significant (permutation test, p<0.001). The theta waves significantly increased in average duration, unlike the alpha waves, whose duration decreased. Similarly, the histograms of the calculated speeds are shown in Figs. 8 (c) and (d). The average speeds for the spontaneous and poststimulus theta waves were 4.0 m/s (SD = 0.6 m/s) and 4.0 m/s (SD = 0.8 m/s) respectively, lower than the alpha speeds. There were no significant changes in the speed during the two intervals (permutation test, p>0.05).


Human cortical traveling waves: dynamical properties and correlations with responses.

Patten TM, Rennie CJ, Robinson PA, Gong P - PLoS ONE (2012)

Histograms of the durations and speeds of prestimulus and poststimulus theta waves measured for all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of poststimulus waves.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3366935&req=5

pone-0038392-g008: Histograms of the durations and speeds of prestimulus and poststimulus theta waves measured for all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of poststimulus waves.
Mentions: A similar analysis was then performed for the theta waves. Figure 8 shows histograms of the average durations and speeds of the theta waves for all trials and subjects during the epochs, 500 ms before and 500 ms after stimulus onset. As summarized in Table 1, the average durations of the prestimulus and poststimulus theta waves across trials and subjects were 84 ms (SD = 12 ms) and 112 ms (SD = 18 ms) respectively, and the difference between the two intervals was significant (permutation test, p<0.001). The theta waves significantly increased in average duration, unlike the alpha waves, whose duration decreased. Similarly, the histograms of the calculated speeds are shown in Figs. 8 (c) and (d). The average speeds for the spontaneous and poststimulus theta waves were 4.0 m/s (SD = 0.6 m/s) and 4.0 m/s (SD = 0.8 m/s) respectively, lower than the alpha speeds. There were no significant changes in the speed during the two intervals (permutation test, p>0.05).

Bottom Line: The spatiotemporal behavior of human EEG oscillations is investigated.Traveling waves in the alpha and theta ranges are found to be common in both prestimulus and poststimulus EEG activity.The dynamical properties of these waves, including their speeds, directions, and durations, are systematically characterized for the first time, and the results show that there are significant changes of prestimulus spontaneous waves in the presence of an external stimulus.

View Article: PubMed Central - PubMed

Affiliation: School of Physics, University of Sydney, Sydney, New South Wales, Australia.

ABSTRACT
The spatiotemporal behavior of human EEG oscillations is investigated. Traveling waves in the alpha and theta ranges are found to be common in both prestimulus and poststimulus EEG activity. The dynamical properties of these waves, including their speeds, directions, and durations, are systematically characterized for the first time, and the results show that there are significant changes of prestimulus spontaneous waves in the presence of an external stimulus. Furthermore, the functional relevance of these waves is examined by studying how they are correlated with reaction times on a single trial basis; prestimulus alpha waves traveling in the frontal-to-occipital direction are found to be most correlated to reaction speeds. These findings suggest that propagating waves of brain oscillations might be involved in mediating long-range interactions between widely distributed parts of human cortex.

Show MeSH