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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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Histogram of the durations and speeds of alpha traveling waves during 500 ms time intervals before and after external stimulus onset, which were measured over all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of the poststimulus waves.
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pone-0038392-g007: Histogram of the durations and speeds of alpha traveling waves during 500 ms time intervals before and after external stimulus onset, which were measured over all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of the poststimulus waves.

Mentions: The histograms of the durations of the alpha waves before and after the stimuli onset are shown in Figs. 7(a) and 7(b). The average of durations and that of speeds across trials and subjects are summarized in Table 1. The average duration of the prestimulus spontaneous waves was 73 ms (SD = 15 ms) while that of poststimulus waves was 62 ms (SD = 11 ms) (Table 1), which was a reduction of 13% (permutation test, p<0.01). Thus, it appears that the average duration of alpha waves also experienced a collective change due to stimuli. Figures 7 (c) and 7(d) show histograms of the speeds, which were mostly concentrated between 2 m/s and 15 m/s. The average speed of the prestimulus alpha waves was 6.5 m/s (SD = 0.9 m/s), and that of the poststimulus alpha waves was 6.2 m/s (SD = 0.9 m/s) (as summarized in Table 1); there were no significant changes in the speeds of alpha waves due to stimuli (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)

Histogram of the durations and speeds of alpha traveling waves during 500 ms time intervals before and after external stimulus onset, which were measured over all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of the poststimulus waves.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3366935&req=5

pone-0038392-g007: Histogram of the durations and speeds of alpha traveling waves during 500 ms time intervals before and after external stimulus onset, which were measured over all subjects.(a) Durations of prestimulus waves. (b) Durations of poststimulus waves. (c) Speeds of prestimulus waves. (d) Speeds of the poststimulus waves.
Mentions: The histograms of the durations of the alpha waves before and after the stimuli onset are shown in Figs. 7(a) and 7(b). The average of durations and that of speeds across trials and subjects are summarized in Table 1. The average duration of the prestimulus spontaneous waves was 73 ms (SD = 15 ms) while that of poststimulus waves was 62 ms (SD = 11 ms) (Table 1), which was a reduction of 13% (permutation test, p<0.01). Thus, it appears that the average duration of alpha waves also experienced a collective change due to stimuli. Figures 7 (c) and 7(d) show histograms of the speeds, which were mostly concentrated between 2 m/s and 15 m/s. The average speed of the prestimulus alpha waves was 6.5 m/s (SD = 0.9 m/s), and that of the poststimulus alpha waves was 6.2 m/s (SD = 0.9 m/s) (as summarized in Table 1); there were no significant changes in the speeds of alpha waves due to stimuli (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