Abstract：
:Brain oscillatory responses of 4-35 Hz EEG frequencies elicited during performance of a visual n-back task with complex visual stimuli were assessed in 20 adult volunteers. Spectral power changes were assessed separately for target and non-target stimuli in four different memory load conditions (0, 1, 2, and 3-back). The presentation of both target and non-target stimuli elicited long-lasting ~4-8 Hz power increases, which were more prominent at the beginning of stimulus onset during presentation of target stimuli, as compared to non-target stimuli, in the 0-back memory load condition. ~8-25 Hz power decreases appeared at stimulus onset. These power decreases were more prominent during the presentation of target stimuli, as compared to non-target stimuli, and their duration increased as a function of memory load between the 0-, 1-, and 2-back, but not the 3-back, memory load conditions. The current results provide further evidence in support of the notion of a complex interplay between both ~4-8 Hz power increases and ~8-25 Hz power decreases during cognitive memory task performance.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Palomäki J,Kivikangas M,Alafuzoff A,Hakala T,Krause CMdoi
10.1016/j.neulet.2012.03.076subject
Has Abstractpub_date
2012-05-10 00:00:00pages
141-5issue
1eissn
0304-3940issn
1872-7972pii
S0304-3940(12)00474-0journal_volume
516pub_type
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