External location of touch is constructed post-hoc based on limb choice

External location of touch is constructed post-hoc based on limb choice
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触摸的外部位置是根据肢体选择事后构建的

DOI:
10.1101/549832
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发表时间:
2019
期刊:
影响因子:
7.7
通讯作者:
Medendorp
Medendorp
中科院分区:
生物学1区
文献类型:
--
作者:
Medendorp

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当人类指出触觉刺激发生在哪只手上时,当他们的手交叉时,他们经常出错。这一发现似乎支持这样的观点,即外部空间中自动确定的触摸位置影响肢体分配:交叉的右手位于左侧空间,这种冲突可能会引起手部分配错误。在这里,参与者判断在双手运动期间出现的两个刺激中的第一个刺激发生在哪只手上,然后通过达到点的运动来指示其外部位置。当参与者错误地选择了第二次刺激的手时,他们指出了那只手在正确的第一时间点的位置,尽管在那个位置没有刺激发生。这种行为表明,刺激定位依赖于手的分配,而不是反之亦然。因此,它与发生时自动计算外部刺激位置的概念不相容。相反,人类构建外部触摸位置事后和需求。
When humans indicate on which hand a tactile stimulus occurred, they often err when their hands are crossed. This finding seemingly supports the view that the automatically determined touch location in external space affects limb assignment: the crossed right hand is localized in left space, and this conflict presumably provokes hand assignment errors. Here, participants judged on which hand the first of two stimuli, presented during a bimanual movement, had occurred, and then indicated its external location by a reach-to-point movement. When participants incorrectly chose the hand stimulated second, they pointed to where that hand had been at the correct, first time point, though no stimulus had occurred at that location. This behavior suggests that stimulus localization depended on hand assignment, not vice versa. It is, thus, incompatible with the notion of automatic computation of external stimulus location upon occurrence. Instead, humans construct external touch location post-hoc and on demand.
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