'Paradoxical' alpha synchronization in a memory task
'Paradoxical' alpha synchronization in a memory task
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DOI：
10.1016/s0926-6410(98)00056-1
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发表时间：
1999-03-01
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影响因子：
--
通讯作者：
Winkler, T
中科院分区：
文献类型：
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作者：
Klimesch, W;Doppelmayr, M;Winkler, T
在情景短期记忆（STM）需求最大化和语义长期记忆（LTM）需求最小化的特殊记忆搜索范式中，上α带在情景短期记忆需求最大的条件和时间间隔中选择性地同步。选择性α同步只发生在α带上部和任务要求最高时，这一发现令人惊讶，因为众所周知，α通常在心理活动中不同步。由于我们实验室的实验表明，上α波段的去同步与语义LTM过程有关，因此本研究表明，该频段的选择性同步反映了语义LTM的抑制。假设一旦达到或超过STM的容量限制，处理资源不再分配，并且潜在的干扰，任务无关，大脑区域或处理系统被抑制。(C) 1999 Elsevier Science B.V.版权所有
The results of a specially designed memory search paradigm which maximizes episodic short-term memory (STM) and minimizes semantic long-term memory (LTM) demands show that the upper alpha band synchronizes selectively in those conditions and time intervals where episodic STM demands are maximal. This finding of a selective alpha synchronization occurring only in the upper alpha band and during highest task demands is surprising because it is well known that usually alpha desynchronizes during mental activity. Because experiments from our laboratory indicate that desynchronization in the upper alpha band is related to semantic LTM processes, the present finding suggests that a selective synchronization in this frequency band reflects inhibition of semantic LTM. It is assumed that once the capacity limits of STM are reached or exceeded, processing resources are no longer distributed and that potentially interfering, task irrelevant, brain areas or processing systems are inhibited. (C) 1999 Elsevier Science B.V. All rights reserved.