Frequency characteristics of evoked and oscillatory electroencephalic activity in a human memory scanning task
Frequency characteristics of evoked and oscillatory electroencephalic activity in a human memory scanning task
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DOI：
10.1016/s0304-3940(02)00846-7
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发表时间：
2002-10-11
影响因子：
2.5
通讯作者：
Klimesch, W
中科院分区：
文献类型：
--
作者：
Schack, B;Klimesch, W
对记忆扫描任务的研究表明，在保持过程中，振荡活动随着负荷的增加而增加，而在提取过程中，诱发功率(EP，组成P3)减少。我们调查这个问题，这两个现象是否主要与theta振荡有关。然而，我们发现，在保留期间，α振荡随着负载的增加而增加，并且恰好在恢复期间，这个频率表现出增加的相位锁定-通过专门开发的相位锁定指数(PLI)来测量。P3波幅的降低与βEP和Pill的降低有关，P3与诱发的三个α峰中的最后一个峰一致。因此，α对于扫描的定时和最可能由P3表现的读出过程的评估可能是重要的。(C)2002爱思唯尔科学爱尔兰有限公司。保留所有权利。
Research on memory scanning tasks indicates that oscillatory activity increases with load during retention, whereas evoked power (EP, comprising the P3) decreases during retrieval. We investigate the question, whether both phenomena are primarily related to theta oscillations. However, we found that during retention alpha oscillations increased with load and that exactly this frequency exhibits increased phase locking - measured by a specially developed phase locking index (PLI) - during retrieval. The decreased P3 amplitude was related to decreased delta EP and PILL The P3 coincides with the last of three evoked alpha peaks. Thus, alpha may be important for the timing of the scanning and the evaluation of the read out process that most likely is manifested by the P3. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.