Brain oscillatory 4-35 Hz EEG responses during an n-back task with complex visual stimuli

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• 作者：Jussi Palomä ; ki^a ; ^{jussi.palomaki@helsinki.fi} ; Markus Kivikangas^a ; ^b ; Aleksander Alafuzoff^a ; Tero Hakala^a ; Christina M. Krause^a
• 关键词：Brain oscillations ; Electroencephalography ; n-Back ; Working memory ; Complex visual stimuli
• 刊名：Neuroscience Letters
• 出版年：2012
• 期刊代码：52_03043940
• 类别：neu
• 出版时间：10 May, 2012
• 卷：516
• 期：1
• 页码：141-145
• 文件大小：492 K

摘要

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 鈭?-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. 鈭?-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 鈭?-8 Hz power increases and 鈭?-25 Hz power decreases during cognitive memory task performance.