The influence of low-level stimulus features on the representation of contexts, items, and their mnemonic associations.
The influence of low-level stimulus features on the representation of contexts, items, and their mnemonic associations.
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DOI：
10.1016/j.neuroimage.2017.04.019
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发表时间：
2017-07-15
期刊：
影响因子：
5.7
通讯作者：
Stark CEL
中科院分区：
文献类型：
--
作者：
Huffman DJ;Stark CEL
自从最早尝试表征神经元的“感受野”以来，许多神经科学实验的中心目标是阐明大脑各个区域所代表的信息。最近的研究表明，在记忆服务中，信息以联合或联想的形式在内侧颞叶中表示，其中体验的上下文方面是联合层次结构的主要因素或最高级别。一个关键问题是，这些研究中观察到的信息是否反映了诸如背景的认知表征之类的概念，或者该信息是否反映了刺激之间的低水平感觉差异。我们进行了两项功能性磁共振成像实验来解决这个问题，我们发现在人脑中观察到的上下文和项目（和顺序）之间的关联表征可能会受到刺激之间低水平感觉差异的高度影响。我们的结果对旨在研究执行联想记忆任务期间上下文和项目的表示的研究的实验设计提出了明确的限制。此外，我们的结果提出了有趣的理论问题，即消除与记忆相关的表征和与处理相关的表征的歧义。
Since the earliest attempts to characterize the “receptive fields” of neurons, a central aim of many neuroscience experiments is to elucidate the information that is represented in various regions of the brain. Recent studies suggest that, in the service of memory, information is represented in the medial temporal lobe in a conjunctive or associative form with the contextual aspects of the experience being the primary factor or highest level of the conjunctive hierarchy. A critical question is whether the information that has been observed in these studies reflects notions such as a cognitive representation of context or whether the information reflects the low-level sensory differences between stimuli. We performed two functional magnetic resonance imaging experiments to address this question and we found that associative representations observed between context and item (and order) in the human brain can be highly influenced by low-level sensory differences between stimuli. Our results place clear constraints on the experimental design of studies that aim to investigate the representation of contexts and items during performance of associative memory tasks. Moreover, our results raise interesting theoretical questions regarding the disambiguation of memory-related representations from processing-related representations.
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影响因子：
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作者：
Albright TD
通讯作者：
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