據(jù)每日科學網(wǎng)近日報道,，加州大學戴維斯分校的最新研究表明，大腦能否記憶并回想起某些事情,，與大腦的狀態(tài)密切相關,。該研究發(fā)表在美國《國家科學院院刊》（PNAS）上。
加州大學戴維斯分校的研究人員測量了志愿者的一種特定頻率的腦電波（西塔波）,，志愿者在測試中根據(jù)特定的上下文的背景,，記憶一系列單詞。隨后志愿者要回憶是否見過某個單詞,，并回憶看到這個單詞的上下文,。結果表明，西塔波的高低與記憶的好壞相關,，西塔波高則記憶表現(xiàn)良好,。研究人員認為，在大多數(shù)情況下,，大腦忙于處理大量與外界無關的大腦內(nèi)部活動,。當外部刺激出現(xiàn)后，大腦的內(nèi)部模式立即與外部刺激發(fā)生互動,。
研究人員表示,，他們正在研究能否人為地將大腦調(diào)整到高西塔波的最佳記憶狀態(tài)，并希望通過這一研究開發(fā)出針對失憶癥的新療法,。（生物谷Bioon.com）
生物谷推薦原文出處：
Proceedings of the National Academy of Sciences DOI： 10.1073/pnas.1014528108
Prestimulus theta activity predicts correct source memory retrieval
Addante, Richard J.; Watrous, Andrew J.; Yonelinas, Andrew P.; Ekstrom, Arne D.; Ranganath, Charan
Recent evidence indicates that the processing of a stimulus can be influenced by preceding patterns of brain activity. Herewe examine whether prestimulus oscillatory brain activity can influence the ability to retrieve episodic memories. Neuralactivity in the theta-frequency band (4–8 Hz) was enhanced before presentation of test items which elicited accurate recollectionof contextual details of the prior study episode (“source retrieval”), relative to trials for which item recognition was successfulbut source retrieval failed. Poststimulus theta activity was also related to source retrieval, and the magnitude of poststimulustheta was predicted by the magnitude of the prestimulus theta effects. The results suggest that ongoing neural processes occurringbefore stimulus onset might play a critical role in readying the brain for successful memory retrieval.
