Decoding individual episodic memory traces in the human hippocampus.

Decoding individual episodic memory traces in the human hippocampus.
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DOI:
10.1016/j.cub.2010.01.053
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发表时间:
2010-03-23
期刊:
Current biology : CB
影响因子:
--
通讯作者:
Maguire EA
Maguire EA
中科院分区:
其他
文献类型:
--
作者:
Chadwick MJ;Hassabis D;Weiskopf N;Maguire EA

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近年来,多变量模式分析已进行功能性磁共振成像(fMRI)的数据,允许预测的精神状态从局部模式的血氧水平依赖(BOLD)信号跨体素。我们先前证明,从海马体中体素的活动模式来预测个体在虚拟现实环境中的位置是可能的。虽然这表明空间记忆可以被解码,但更具挑战性的是,可以说只有在人类身上才有可能进行研究,是否可以预测一个人正在回忆的复杂的日常经历或情景记忆。在这里,我们第一次证明,个人丰富的情景记忆的痕迹是可检测的,并可单独从人类海马体中的体素的fMRI BOLD信号的模式进行区分。在这样做的过程中,我们发现了一个可能的功能地形海马,优先情节处理的一些海马区比其他。此外,我们的研究结果表明,情节记忆的神经元痕迹是稳定的(因此是可预测的),即使在许多重新激活。最后,我们的数据提供了进一步的证据,内侧颞叶内的功能分化,在我们的海马比邻近的结构包含更多的情节信息。从fMRI活动中解码特定的情景记忆痕迹是可能的。可以从人类海马(HC)的fMRI活动中解码个体记忆。HC比相邻的脑区包含更多的情景信息。情景信息定位于双侧前部和右后部HC。
In recent years, multivariate pattern analyses have been performed on functional magnetic resonance imaging (fMRI) data, permitting prediction of mental states from local patterns of blood oxygen-level-dependent (BOLD) signal across voxels. We previously demonstrated that it is possible to predict the position of individuals in a virtual-reality environment from the pattern of activity across voxels in the hippocampus. Although this shows that spatial memories can be decoded, substantially more challenging, and arguably only possible to investigate in humans, is whether it is feasible to predict which complex everyday experience, or episodic memory, a person is recalling. Here we document for the first time that traces of individual rich episodic memories are detectable and distinguishable solely from the pattern of fMRI BOLD signals across voxels in the human hippocampus. In so doing, we uncovered a possible functional topography in the hippocampus, with preferential episodic processing by some hippocampal regions over others. Moreover, our results imply that the neuronal traces of episodic memories are stable (and thus predictable) even over many re-activations. Finally, our data provide further evidence for functional differentiation within the medial temporal lobe, in that we show the hippocampus contains significantly more episodic information than adjacent structures. ► It is possible to decode specific episodic memory traces from fMRI activity ► Individual memories can be decoded from fMRI activity in the human hippocampus (HC) ► The HC contains significantly more episodic information than adjacent brain areas ► Episodic information is localized to bilateral anterior and right posterior HC
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