Center-Surround Inhibition in Working Memory.
Center-Surround Inhibition in Working Memory.
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DOI：
10.1016/j.cub.2015.11.013
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发表时间：
2016-01-11
期刊：
影响因子：
--
通讯作者：
Egner T
中科院分区：
文献类型：
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作者：
Kiyonaga A;Egner T
将视觉注意力引向环境中的特定特征或位置会抑制对附近刺激的处理。这种“抑制性环绕”注意力机制与视网膜神经节细胞感受野的中心-环绕组织相呼应，并使竞争性局部神经元动力学偏向于任务相关的刺激，强调了任务相关和不相关项目之间的界限。在这里，我们表明，内部保持在工作记忆（WM）的颜色刺激，而不是视觉上参加在外部环境中的刺激，产生类似的模式的抑制刺激附近的颜色空间。复制一个众所周知的效果，注意力捕捉的刺激，匹配WM内容，视觉注意力偏向（任务无关）刺激，完全匹配的WM项目。然而，对于与WM内容非常相似的刺激（即，在WM焦点周围的抑制区内），并且对于不太相似的刺激恢复（即，超出抑制性环境的界限）。此外，这种抑制作用的表达与观察者的WM表现呈正相关。在第二个实验中，抑制也发生在两个项目同时举行的WM。这表明，WM中的维持的特征在于以（内部）注意力焦点为中心的兴奋峰，周围是抑制区，以限制不相关和易混淆的表征的干扰。因此，在这里，我们第一次表明，同样的中心-环绕选择机制，集中视觉注意力的感官刺激，也选择性地保持内部激活的代表在WM。
Directing visual attention toward a particular feature or location in the environment suppresses processing of nearby stimuli –. Echoing the center-surround organization of retinal ganglion cell receptive fields, and biasing of competitive local neuronal dynamics in favor of task-relevant stimuli, this “inhibitory surround” attention mechanism accentuates the demarcation between task-relevant and irrelevant items. Here, we show that internally maintaining a color stimulus in working memory (WM), rather than visually attending the stimulus in the external environment, produces an analogous pattern of inhibition for stimuli that are nearby in color space. Replicating a well-known effect of attentional capture by stimuli that match WM content, visual attention was biased toward (task-irrelevant) stimuli that exactly matched a WM item. This bias was curtailed, however, for stimuli that were very similar to the WM content (i.e., within the inhibitory zone surrounding the focus of WM), and recovered for less similar stimuli (i.e., beyond the bounds of the inhibitory surround). Moreover, the expression of this inhibition effect was positively associated with WM performance across observers. In a second experiment, inhibition also occurred between two items simultaneously held in WM. This suggests that maintenance in WM is characterized by an excitatory peak centered on the focus of (internal) attention, surrounded by an inhibitory zone to limit interference by irrelevant and confusable representations. Here, thus, we show for the first time that the same center-surround selection mechanism that focuses visual attention on sensory stimuli also selectively maintains internally activated representations in WM.