Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub. 2009, 153(1):41-46 | DOI: 10.5507/bp.2009.007

Pictorial cognitive task solving and dynamics of event - related desynchronization

Josef Petrek
Department of Physiology, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic

AIMS: To analyze the event-related desynchronization/synchronization (ERD/ERS) attended with the mental load arising while solving two cognitive tasks. The features of the presented visual stimulus determined the type of cognitive task that should be solved.

METHODS: For each experimental task and everybody's subject FFT Analysis module calculated the total power histograms from a fixed frequency band (3-20 Hz or 8-13 Hz) for each 3-second EEG sample with 50 % overlay and all electrodes. From the histograms the software derived two FFT single values - The average Total Power (TP) and Frequency at Maximum Power (FMP).

RESULTS: It has been shown that during the solution of cognitive tasks the marked changes of ongoing EEG activity appeared. The short lasting and localized amplitude decrease in rhythmic activity (ERD) and the change of EEG frequency were among the most frequent. The ERD extent was determined by an informational content of processed visual stimuli and by the site of scalp-recording electrode. A higher mental load related to the solution of cognitive tasks shifted the average FM to lower frequencies.

CONCLUSION: The suitability of an analysis of ongoing EEG activity to uncover differences in people's brain activation patterns when engaged in performing cognitively demanding tasks was proved.

Keywords: Cognitive task, Total Power, Frequency at Maximum Power, ERD

Received: July 22, 2008; Accepted: September 25, 2008; Published: March 1, 2009  Show citation

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Petrek, J. (2009). Pictorial cognitive task solving and dynamics of event - related desynchronization. Biomedical papers, 153(1), 41-46. doi: 10.5507/bp.2009.007
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    References

    1. Bastiaansen MCM, Van Berkum JJA, Hagoort P. Event-related theta power increases in the human EEG during online sentence processing. Neurosci Letters 2002; 323:13-6. Go to original source... Go to PubMed...
    2. Berger H. Ûber das Electroencephalogramm des Menschen: 1. Mitteilung. Arch Psychiatr Nervenkr 1929; 87:527-8. Go to original source...
    3. Faber J. Electroencephalography and psychophysiology (in Czech). Praha: ISV; 2000.
    4. Faber J. QEEG: Correlation of EEG analysis with psychological tests. Praha: Galén; 2005.
    5. Guderian S, Düzel E. Inducced theta oscillations mediate largescale synchrony with mediotemporal areas during recollection in humans. Hippocampus 2005; 15:901-12. Go to original source... Go to PubMed...
    6. Klimesch W. EEG alpha and theta oscillation reflect cognitive and memory performance: a review and analysis. Brain Res Rev 1999; 29:169-95. Go to original source... Go to PubMed...
    7. Kollarik T, Poliakova E, Ritomsky A. Freiburský osobnostný dotaznik (in Slovak). Bratislava: Psychodiagnostické a didaktické testy, 1984.
    8. Krause CM, Lang AH, Laine M, Kuusisto M, Pörn B. Event-related desynchronization and synchronization during an auditory memory task. Electroenceph clin Neurophysiol 1996; 98:319-26. Go to original source... Go to PubMed...
    9. Krause CM, Silanmäki L, Koivisto M, Saarela C, Häggqvist A, Laine M, Hämäläinen H. The effects of memory load on eventrelated EEG desynchronization and synchronization. Clin Neurophysiol 2000; 111:2071-78. Go to original source... Go to PubMed...
    10. Krause CM, Grönholm P, Leinonen A. Laine M, Säkkinen AL, Söderholm C. Modality matters: The effects of stimulus modality on the 4- to 30-Hz electric oscillation during a lexical decision task. Brain Res 2006; 1110:182-192. Go to original source... Go to PubMed...
    11. Mazaheri A, Picton TW. EEG spectral dynamics during discrimination of auditory and visual targets. Cogn Brain Res 2005; 24:81-96. Go to original source... Go to PubMed...
    12. Morrel LK. Some characteristics of stimulus-provoked alpha activity. Electroenceph clin Neurophysiol 1996; 21:552-61. Go to original source... Go to PubMed...
    13. Neuper C, Klimesch W, editors. Event-related dynamics of brain oscillations. Amsterdam: Elsevier; 2006.
    14. Petrek J. Selection of two identical pictures from a group of similar ones: Changes in ongoing EEG activity. Activ Nerv Sup 2008; 50:3-8. Go to original source...
    15. Petrek J. Pictorial cognitive task solving and dynamics of eventrelated potentials. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2008; 152:223-230. Go to original source... Go to PubMed...
    16. Pesonen M, Björnberg CH, Hämäläinen H, Krause CM. Brain oscillatory 1-30 Hz EEG ERD/ERS responses during the different stages of an auditory memory search task. Neurosci Letters 2006; 399:45-50. Go to original source... Go to PubMed...
    17. Pfurtscheller G. Graphical display and statistical evaluation of event-related desynchronization (ERD). Electroenceph clin Neurophysiol 1977; 43:757-60. Go to original source... Go to PubMed...
    18. Pfurtscheller G. Event-related synchronization (ERS): an electrophysiological correlate of cortical areas at rest. Electroenceph clin Neurophysiol 1992; 83:62-9. Go to original source... Go to PubMed...
    19. Pfurtscheller G.: Functional brain imaging based on ERD/ERS. Vision Res. 2001; 41:1257-60. Go to original source... Go to PubMed...
    20. Pfurtscheller G. Induced oscillations in the alpha band: Functional meaning. Epilepsia 2003; 44 (Suppl 12):2-8. Go to original source... Go to PubMed...
    21. Pfurtscheller G, Aranibar A. Event-related cortical desynchronization detected by power measurements of scalp EEG. Electroenceph clin Neurophysiol 1977; 42:817-26. Go to original source... Go to PubMed...
    22. Pfurtscheller G, Neuper C, Mohl W. Event-related desynchronization (ERD) during visual processing. Int J Psychophysiol 1994; 16:147-53. Go to original source... Go to PubMed...
    23. Pfurtscheller G, Lopes da Silva FH. Event related EEG/MEG synchronization and desynchronization : basic principles. Clin Neurophysiol 1999; 110:1842-57. Go to original source... Go to PubMed...
    24. Pfurtscheller G, Neuper C, Pichler-Zalaudek K, Edlinger G, Lopes da Silva FH. Do brain oscillations of different frequencies indicate interaction between cortical areas. Neurosci Letters 2000; 286:66- 8. Go to original source... Go to PubMed...
    25. Pulvermüller F, Birbaumer N, Lutzenberger W, Mohr B. Highfrequency brain activity: Its possible role in attention, perception and language processing. Progress Neurobiol 1997; 52:427-45. Go to original source... Go to PubMed...
    26. Van Dijk JG, Caekebeke JFV, Jennekens-Schinkel A, Ywinderman AH. Background EEG activity in auditory event related potentials. Electroenceph clin Neurophysiol 1992; 83:44-51. Go to original source... Go to PubMed...

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