Broadband high-frequency EEG power modulations vary with behavioral task
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1
UC San Diego, United States
Broadband high frequency modulations of spectral power appear frequently in ECoG recordings from the cortical surface, but are typically considered difficult to differentiate from muscle when recorded from EEG scalp electrodes. Recently, we reported using independent component analysis (ICA) to find independent sources of EEG brain activity, followed by ICA decomposition of the spectrogram of each independent component process. This returned broadband high-frequency (bhf) modulations (~30 to 150-250 Hz) that were neither in phase nor co-modulated with broadband power fluctuations from scalp muscle activities. Further, mean bhf power levels from brain components exhibited different values when subjects were imagining various emotional states (Onton, 2009). Here, we collected EEG data during different behavioral task conditions to explore how and where bhf modulations were regulated under varying cognitive demands. In a letter two-back continuous performance task including auditory feedback signals after every manual response, bhf modulators in bilateral occipital areas showed a dip in power after feedback and before the next letter presentation. In the same task, left superior temporal IC phf power increased after 'incorrect' feedback. In a separate task involving a physical orienting response (head turn plus pointing) a bhf power in a frontal midline component cluster was activated during the acceleration phase of the head turn (Gramann, in preparation). These results show that broadband high frequency-modulations of power in source EEG activities are readily detectable in high-density scalp EEG recordings and are regulated differently depending on task demands. Funding: Supported by Swartz Foundation.
Keywords:
brain oscillations,
EEG
Conference:
XI International Conference on Cognitive Neuroscience (ICON XI), Palma, Mallorca, Spain, 25 Sep - 29 Sep, 2011.
Presentation Type:
Poster Presentation
Topic:
Poster Sessions: Quantitative Analysis of EEG, MEG & Brain Oscillations
Citation:
Onton
JA,
Gramann
K and
Makeig
S
(2011). Broadband high-frequency EEG power modulations vary with behavioral task.
Conference Abstract:
XI International Conference on Cognitive Neuroscience (ICON XI).
doi: 10.3389/conf.fnhum.2011.207.00137
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Received:
17 Nov 2011;
Published Online:
28 Nov 2011.
*
Correspondence:
Dr. Julie A Onton, UC San Diego, San Diego, United States, jonton@ucsd.edu