Maintenance of tactile short-term memory for locations is mediated by spatial attention
Maintenance of tactile short-term memory for locations is mediated by spatial attention
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DOI：
10.1016/j.biopsycho.2011.09.001
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发表时间：
2012-01-01
影响因子：
2.6
通讯作者：
Mueller, Matthias M.
中科院分区：
文献类型：
--
作者：
Katus, Tobias;Andersen, Soren K.;Mueller, Matthias M.
根据基于注意的排演假设，空间信息的维持是通过对记忆位置的隐蔽定向来调节的。在体感记忆任务中，参与者同时收到双侧机械样本脉冲。对于每只手，样本刺激被随机分配到三个位置（手指）之一。随后的视觉回溯提示决定了是要记住左手还是右手的样本。回溯线索引发了反映相关样本刺激位置的侧化活动。保留期间的感觉加工通过随机分配到被提示手和未被提示手位置的与任务无关的脉冲来探测。相对于未被提示的手，被提示的手的体感N140增强。在回溯提示后不久呈现的探针显示出最大的注意调制。这表明回顾性选择的短暂贡献与基于注意的排练的持续影响重叠。结果表明，在记忆过程中，触觉记忆内容的焦点转移发生在回溯线索和引导感觉加工之后。(C) 2011 Elsevier B.V.版权所有
According to the attention-based rehearsal hypothesis, maintenance of spatial information is mediated by covert orienting towards memorized locations. In a somatosensory memory task, participants simultaneously received bilateral pairs of mechanical sample pulses. For each hand, sample stimuli were randomly assigned to one of three locations (fingers). A subsequent visual retro-cue determined whether the left or right hand sample was to be memorized. The retro-cue elicited lateralized activity reflecting the location of the relevant sample stimulus. Sensory processing during the retention period was probed by task-irrelevant pulses randomized to locations at the cued and uncued hand. The somatosensory N140 was enhanced for probes delivered to the cued hand, relative to uncued. Probes presented shortly after the retro-cue showed greatest attentional modulations. This suggests that transient contributions from retrospective selection overlapped with the sustained effect of attention-based rehearsal. In conclusion, focal attention shifts within tactile mnemonic content occurred after retro-cues and guided sensory processing during retention. (C) 2011 Elsevier B.V. All rights reserved.