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首页> 外文期刊>Journal of Experimental Psychology. General >An electrophysiological signature of summed similarity in visual working memory
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An electrophysiological signature of summed similarity in visual working memory

机译：视觉工作记忆中总相似度的电生理信号

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摘要

Summed-similarity models of short-term item recognition posit that participants base their judgments of an item's prior occurrence on that item's summed similarity to the ensemble of items on the remembered list. We examined the neural predictions of these models in 3 short-term recognition memory experiments using electrocorticographic/depth electrode recordings and scalp electroencephalography. On each experimental trial, participants judged whether a test face had been among a small set of recently studied faces. Consistent with summed-similarity theory, participants' tendency to endorse a test item increased as a function of its summed similarity to the items on the just-studied list. To characterize this behavioral effect of summed similarity, we successfully fit a summed-similarity model to individual participant data from each experiment. Using the parameters determined from fitting the summed-similarity model to the behavioral data, we examined the relation between summed similarity and brain activity. We found that 4–9 Hz theta activity in the medial temporal lobe and 2–4 Hz delta activity recorded from frontal and parietal cortices increased with summed similarity. These findings demonstrate direct neural correlates of the similarity computations that form the foundation of several major cognitive theories of human recognition memory.
机译：短期项目识别的总相似度模型假定参与者对某项项目先前发生的判断基于该项目与已记住列表中各项的总相似度的总相似度。我们在3个短期识别记忆实验中使用皮质/深度电极记录和头皮脑电图检查了这些模型的神经预测。在每个实验试验中，参与者都判断一张测试脸是否属于一小批最近研究过的脸。与求和相似度理论相一致，参与者对测试项目的认可倾向随其与刚研究的列表中项目的求和相似度的增加而增加。为了表征这种相似度总和的行为效应，我们成功地将相似度总和模型拟合到每个实验的个体参与者数据中。使用通过将求和相似度模型拟合到行为数据而确定的参数，我们检查了求和相似度与大脑活动之间的关系。我们发现内侧颞叶的4–9 Hz theta活性和额叶和顶叶皮层记录的2–4 Hzδ活性随相似度的增加而增加。这些发现证明了相似度计算的直接神经相关性，这些相似度计算构成了人类识别记忆的几种主要认知理论的基础。

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