Academic Journal
EEG alpha and theta time-frequency structure during a written mathematical task.
| العنوان: | EEG alpha and theta time-frequency structure during a written mathematical task. |
|---|---|
| المؤلفون: | Bonança, Giovanna M.1 (AUTHOR), Gerhardt, Günther J. L.2 (AUTHOR), Molan, André L.1 (AUTHOR), Oliveira, Luiz M. A.1 (AUTHOR), Jarola, Gustavo M.1 (AUTHOR), Schönwald, Suzana V.3 (AUTHOR), Rybarczyk-Filho, José L.1 (AUTHOR) jose.luiz@unesp.br |
| المصدر: | Medical & Biological Engineering & Computing. Jun2024, Vol. 62 Issue 6, p1869-1885. 17p. |
| مصطلحات موضوعية: | *PROBLEM solving, ALPHA rhythm, SITTING position, ELECTROENCEPHALOGRAPHY, ENCYCLOPEDIAS & dictionaries |
| مستخلص: | Since the first electroencephalogram (EEG) was obtained, there have been many possibilities to use it as a tool to access brain cognitive dynamics. Mathematical (Math) problem solving is one of the most important cortical processes, but it is still far from being well understood. EEG is an inexpensive and simple indirect measure of brain operation, but only recently has low-cost equipment (mobile EEG) allowed sophisticated analyses in non-clinical settings. The main purpose of this work is to study EEG activation during a Math task in a realistic environment, using mobile EEG. A matching pursuit (MP)-based signal analysis technique was employed, since MP properties render it a priori suitable to study induced EEG activity over long time sequences, when it is not tightly locked to a given stimulus. The study sample comprised sixty healthy volunteers. Unlike the majority of previous studies, subjects were studied in a sitting position with their eyes open. They completed a written Math task outside the EEG lab, wearing a mobile EEG device (EPOC+). Theta [4 Hz–7.5 Hz], alpha (7.5 Hz–13 Hz] and 0.5 Hz micro-bands in the [0.5 Hz–20 Hz] range were studied with a low-density stochastic MP dictionary. Over 1-min windows, ongoing EEG alpha and theta activity was decomposed into numerous MP atoms with median duration around 3 s, similar to the duration of induced, time-locked activity obtained with event-related (des)synchronization (ERS/ERD) studies. Relative to Rest, there was lower right-side and posterior MP alpha atom/min during Math, whereas MP theta atom/min was significantly higher on anteriorly located electrodes, especially on the left side. MP alpha findings were particularly significant on a narrow range around 10 Hz–10.5 Hz, consistent with FFT alpha peak findings from ERS/ERD studies. With a streamlined protocol, these results replicate previous findings of EEG alpha and theta activation obtained during Math tasks with different signal analysis techniques and in different time frames. The efficient application to real-world, noisy EEG data with a low-resolution stochastic MP dictionary shows that this technique is very encouraging. These results provide support for studies of mathematical cognition with mobile EEG and matching pursuit. [ABSTRACT FROM AUTHOR] |
| Copyright of Medical & Biological Engineering & Computing is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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