Alpha-Band Activity Reveals Spontaneous Representations of Spatial Position in Visual Working Memory.
Alpha-Band Activity Reveals Spontaneous Representations of Spatial Position in Visual Working Memory.
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DOI：
10.1016/j.cub.2017.09.031
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发表时间：
2017-10-23
期刊：
影响因子：
--
通讯作者：
Awh E
中科院分区：
文献类型：
--
作者：
Foster JJ;Bsales EM;Jaffe RJ;Awh E
一种新兴的观点认为，空间位置是工作记忆（WM）的一个组成部分，因此，无论空间是否相关，非空间特征都与位置联系在一起。例如，过去的研究表明，当非空间特征被存储时，刺激位置会被自发地记住。当备忘录出现在它们被编码的同一位置时，项目识别能力得到增强，而访问非空间信息会引起空间注意力向刺激的原始位置转移。然而，这些发现并不能证明刺激位置的持续、积极表征在WM中得以维持，因为类似的效应也被记录在长期记忆中。本研究表明，在非空间WM任务中，备忘录的空间位置是由持续的神经活动主动编码的。我们使用空间编码模型结合脑电图测量振荡α波段（8-12 Hz）活动来跟踪空间位置的主动表征。刺激的位置每次试验都不同，但与任务完全无关。然而，我们观察到原始刺激位置的活跃神经表征在整个保留间隔中持续存在。进一步的实验证实，这些空间表征依赖于非空间特征的意志存储，而不是感觉能量或初始编码需求的挥之不去的影响。这些发现提供了强有力的证据，证明在非空间特征的存储过程中，在线空间表征是自发地在WM中保持的——无论任务相关性如何。
An emerging view suggests that spatial position is an integral component of working memory (WM), such that non-spatial features are bound to locations regardless of whether space is relevant. For instance, past work has shown that stimulus position is spontaneously remembered when non-spatial features are stored. Item recognition is enhanced when memoranda appear at the same location where they were encoded, and accessing non-spatial information elicits shifts of spatial attention to the original position of the stimulus. However, these findings do not establish that a persistent, active representation of stimulus position is maintained in WM because similar effect have also been documented following storage in long-term memory. Here, we show that the spatial position of the memorandum is actively coded by persistent neural activity during a non-spatial WM task. We used a spatial encoding model in conjunction with EEG measurements of oscillatory alpha-band (8–12 Hz) activity to track active representations of spatial position. The position of the stimulus varied trial-to-trial but was wholly irrelevant to the tasks. We nevertheless observed active neural representations of the original stimulus position that persisted throughout the retention interval. Further experiments established that these spatial representations are dependent on the volitional storage of non-spatial features rather than being a lingering effect of sensory energy or initial encoding demands. These findings provide strong evidence that online spatial representations are spontaneously maintained in WM – regardless of task relevance – during the storage of non-spatial features.
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影响因子：
8.2
作者：
Foster JJ;Sutterer DW;Serences JT;Vogel EK;Awh E
通讯作者：
Awh E
影响因子：
1.8
作者：
Bays PM;Catalao RF;Husain M
通讯作者：
Husain M
DOI：
10.3758/bf03211918
发表时间：
1998-01-01
期刊：
PERCEPTION & PSYCHOPHYSICS
影响因子：
--
作者：
Dill, M;Fahle, M
通讯作者：
Fahle, M
影响因子：
--
作者：
Pelli, DG
通讯作者：
Pelli, DG
影响因子：
25
作者：
McNab, Fiona;Klingberg, Torkel
通讯作者：
Klingberg, Torkel