通过视觉-触觉重新校准来调整感知手图的大小。

IF 2.7 4区 医学 Q3 NEUROSCIENCES European Journal of Neuroscience Pub Date : 2024-11-15 DOI:10.1111/ejn.16571
Xaver Fuchs, Tobias Heed
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引用次数: 0

摘要

当同时出现的视觉和触觉刺激在空间偏移的情况下重复出现后,单感觉触觉刺激也会在空间上偏向于之前出现的视觉刺激。这种所谓的视觉-触觉腹语后效反映了跨模态的重新校准。由于触觉与身体部位有着内在联系,因此我们在此询问,重新校准是发生在单个刺激水平上,还是发生在更高的、综合的、类似地图的水平上。我们在参与者隐藏的左手上施加触觉刺激,并同时呈现具有空间偏移的视觉刺激,如果这些刺激与触觉刺激整合在一起,就意味着一只更大的手。重新校准后,参与者指向仅有触觉的刺激物,并判断手上两个触觉刺激物之间的距离。重新校准后触觉定位的变化模式与参与者瞄准的是一只变大的手的目标相一致。这种效应在重新校准过程中未与视觉刺激配对的新的纯触觉位置上也很明显。相比之下,距离判断并没有受到重新校准的持续影响。重新校准对新的、非训练过的刺激点的普遍性,但不是对所有任务和反应的普遍性,表明低水平的多感官加工和类似地图的身体表征之间存在联系,然而,这些表征可能具有特定目的,而不是作为一种通用的 "身体图式 "组织起来的。
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Rescaling perceptual hand maps by visual-tactile recalibration.

After concurrent visual and tactile stimuli have been presented repeatedly with a spatial offset, unisensory tactile stimuli, too, are perceived with a spatial bias towards the previously presented visual stimuli. This so-called visual-tactile ventriloquism aftereffect reflects crossmodal recalibration. As touch is intrinsically linked to body parts, we asked here whether recalibration occurs at the level of individual stimuli or at a higher, integrated, map-like level. We applied tactile stimuli to participants' hidden left hand and simultaneously presented visual stimuli with spatial offsets that, if integrated with the tactile stimuli, implied a larger hand. After recalibration, participants pointed to tactile-only stimuli and judged the distance between two tactile stimuli on the hand. The pattern of changes in tactile localization after recalibration was consistent with participants aiming at targets on an enlarged hand. This effect was evident also for new, tactile-only locations that had not been paired with visual stimuli during recalibration. In contrast, distance judgements were not consistently affected by recalibration. The generalization of recalibration to new, non-trained stimulus sites, but not across tasks and responses, suggests a link of low-level multisensory processing and map-like body representations that may, however, be purpose-specific and not organized as a general-purpose "body schema".

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来源期刊
European Journal of Neuroscience
European Journal of Neuroscience 医学-神经科学
CiteScore
7.10
自引率
5.90%
发文量
305
审稿时长
3.5 months
期刊介绍: EJN is the journal of FENS and supports the international neuroscientific community by publishing original high quality research articles and reviews in all fields of neuroscience. In addition, to engage with issues that are of interest to the science community, we also publish Editorials, Meetings Reports and Neuro-Opinions on topics that are of current interest in the fields of neuroscience research and training in science. We have recently established a series of ‘Profiles of Women in Neuroscience’. Our goal is to provide a vehicle for publications that further the understanding of the structure and function of the nervous system in both health and disease and to provide a vehicle to engage the neuroscience community. As the official journal of FENS, profits from the journal are re-invested in the neuroscientific community through the activities of FENS.
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