Human cortical responses during one-bit short-term memory. A high-resolution EEG study on delayed choice reaction time tasks
Human cortical responses during one-bit short-term memory. A high-resolution EEG study on delayed choice reaction time tasks
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DOI：
10.1016/s1388-2457(03)00286-4
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发表时间：
2004-01-01
影响因子：
4.7
通讯作者：
Rossini, PM
中科院分区：
文献类型：
--
作者：
Babiloni, C;Babiloni, F;Rossini, PM
目的：我们调查是否一个非常简单的短期记忆（STM）的需求引起了明显的变化，EEG的节奏在两个hemisles.Methods：高分辨率EEG在两个延迟选择反应时间任务的年轻人。在STM条件下，一个简单的线索刺激（一位）被记忆沿着一个短暂的延迟期（3.5-5.5秒）。结果：在控制（NSTM）条件下，线索刺激保持可用沿着延迟期。与对照条件相比，θ功率（4-6 Hz）在左额叶和双侧顶叶区域（延迟期）降低。此外，双侧额叶和左侧顶叶的低α功率（6- 8Hz）降低，左侧额顶区的高α功率（10-12 Hz）降低。结论：α功率降低是丘脑-皮层通路有效信息传递的表现。这项研究的重要性在于，即使是一个非常简单的短时记忆任务（只需要记住一个位），也能揭示出额顶θ和α节律的变化。(C)2004年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: We investigated whether a very simple short-term memory (STM) demand induces a visible change of EEG rhythms over the two hemispheres.Methods: High-resolution EEG was obtained in young adults during two delayed choice reaction time tasks. In the STM condition, a simple cue stimulus (one bit) was memorized along a brief delay period (3.5-5.5 s). The task was visuo-spatial in nature.Results: In the control (NSTM) condition, the cue stimulus remained available along the delay period. Compared to the control condition, the theta power (4-6 Hz) decreased in left frontal and bilateral parietal areas (delay period). Furthermore, low alpha power (6-8 Hz) decreased in bilateral frontal and left parietal areas, while high alpha power (10-12 Hz) decreased in the left fronto-parietal areas.Conclusions: The decrease of the alpha power is as an expression of the efficient information transfer within thalamo-cortical pathways. The significance of the study stands in the fact that even a very simple STM task (only one bit to be memorized) revealed changes in frontoparietal theta and alpha rhythms. (C) 2004 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.