Rösler F, Heil M, Glowalla U
Department of Psychology, Philipps-University, Marburg, Germany.
Psychophysiology. 1993 Mar;30(2):170-82. doi: 10.1111/j.1469-8986.1993.tb01730.x.
Slow event-related brain potentials of nine subjects were recorded in an experimentally controlled long-term memory retrieval task (the Fan paradigm) from electrode sites F3, Fz, F4, Cz, P3, Pz, and P4. In all retrieval conditions, a very pronounced DC-like negative potential appeared over the left frontal cortex. This negativity was switched on with the presentation of the probe stimuli and prevailed in some conditions throughout the total recording epoch of 14 s. Particular retrieval conditions became manifest in distinct slow wave effects. The amplitude of a bilaterally distributed frontal negative slow wave increased when a more diversified associative structure had to be searched. The amplitude of another negative slow wave, which peaked bilaterally over parietal areas, was affected by the type of concepts that had to be retrieved. The amplitude was larger with general concepts (category labels) and smaller with specific concepts (category exemplars). These results suggest that distinct strategies are invoked when subjects are required to draw conclusions about different contents stored permanently in an associative network.
在一项实验控制的长期记忆检索任务（扇形范式）中，从F3、Fz、F4、Cz、P3、Pz和P4电极部位记录了9名受试者的慢事件相关脑电位。在所有检索条件下，左额叶皮层出现了非常明显的类似直流的负电位。这种负电位在呈现探测刺激时开启，并在某些条件下在整个14秒的记录时段中持续存在。特定的检索条件在不同的慢波效应中表现出来。当需要搜索更多样化的联想结构时，双侧分布的额叶负慢波的振幅会增加。另一个负慢波在顶叶区域双侧达到峰值，其振幅受必须检索概念类型的影响。一般概念（类别标签）时振幅较大，特定概念（类别示例）时振幅较小。这些结果表明，当要求受试者对永久存储在联想网络中的不同内容得出结论时，会调用不同的策略。
