Chen Y G, Chen X, Kuang C W, Huang X T
Key Laboratory of Cognition and Personality (Ministry of Education), School of Psychology, Southwest University, Chongqing 400715, China.
Key Laboratory of Cognition and Personality (Ministry of Education), School of Psychology, Southwest University, Chongqing 400715, China.
Neuroscience. 2015 Apr 2;290:389-97. doi: 10.1016/j.neuroscience.2015.01.036. Epub 2015 Jan 28.
Working memory (WM) is a core element of temporal information processing, but little is known about the internal representation and neuronal underpinnings of the duration maintenance in WM. The neural oscillations during maintenance of duration in WM were examined using electroencephalogram (EEG) recordings. The EEG results showed that theta amplitude was not modulated by the length of duration retained in WM, while alpha amplitude decreased in a 4-s duration condition compared with 1-s, 2-s, and 3-s duration conditions. The amplitude of alpha power positively correlated with accuracy for the 3-s duration condition. The results suggest that alpha activity is involved in duration maintenance in WM. Our study provides electrophysiological evidence that different internal representations are retained in WM for durations below and above about 3s.
工作记忆（WM）是时间信息处理的核心要素，但对于工作记忆中持续时间维持的内部表征和神经基础却知之甚少。我们使用脑电图（EEG）记录来研究工作记忆中持续时间维持期间的神经振荡。EEG结果显示，θ波振幅并未受到工作记忆中保留的持续时间长度的调节，而在4秒持续时间条件下，α波振幅与1秒、2秒和3秒持续时间条件相比有所下降。在3秒持续时间条件下，α波功率的振幅与准确性呈正相关。结果表明，α波活动参与了工作记忆中的持续时间维持。我们的研究提供了电生理证据，表明在工作记忆中，大约3秒以下和以上的持续时间保留了不同的内部表征。
