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Tactile numerosity is coded in external space
Cortex ( IF 3.6 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.cortex.2020.10.008
Irene Togoli 1 , Cathy Marlair 2 , Olivier Collignon 2 , Roberto Arrighi 3 , Virginie Crollen 2
Affiliation  

Humans, and several non-human species, possess the ability to make approximate but reliable estimates of the number of objects around them. Alike other perceptual features, numerosity perception is susceptible to adaptation: exposure to a high number of items causes underestimation of the numerosity of a subsequent set of items, and vice versa. Several studies have investigated adaptation in the auditory and visual modality, whereby stimuli are preferentially encoded in an external coordinate system. As tactile stimuli are primarily coded in an internal (body-centered) reference frame, here we ask whether tactile numerosity adaptation operates based on internal or external spatial coordinates as it occurs in vision or audition. Twenty participants performed an adaptation task with their right hand located either in the right (uncrossed) or left (crossed) hemispace, in order for the two hands to occupy either two completely different positions, or the same position in space, respectively. Tactile adaptor and test stimuli were passively delivered either to the same (adapted) or different (non-adapted) hands. Our results show a clear signature of tactile numerosity adaptation aftereffects with a pattern of over- and under-estimation according to the adaptation rate (low and high, respectively). In the uncrossed position, we observed stronger adaptation effects when adaptor and test stimuli were delivered to the “adapted” hand. However, when both hands were aligned in the same spatial position (crossed condition), the magnitude of adaptation was similar irrespective of which hand received adaptor and test stimuli. These results demonstrate that numerosity information is automatically coded in external coordinates even in the tactile modality, suggesting that such a spatial reference frame is an intrinsic property of numerosity processing irrespective of the sensory modality.



中文翻译:

触觉数字被编码在外部空间

人类和一些非人类物种具有对周围物体数量进行近似但可靠的估计的能力。像其他感知特征一样,数字能力感知也容易适应:暴露于大量物品会导致对随后一组物品的数字能力的低估,反之亦然。几项研究已经研究了听觉和视觉方式的适应性,从而将刺激优先编码在外部坐标系中。由于触觉刺激主要是在内部(以身体为中心)参考帧中编码的,因此我们在此询问触觉数字适应性是基于视觉还是听觉中发生的内部或外部空间坐标而进行的。二十名参与者用右手位于右(未交叉)或左(交叉)半空间的位置执行适应任务,以便两只手分别占据两个完全不同的位置或在空间中的相同位置。触觉适配器和测试刺激被被动地传递给相同(适应)或不同(非适应)的手。我们的研究结果表明,根据适应率(分别为低和高),高估和低估了触觉适应性后效应的明显特征。在未交叉的位置,当适配器和测试刺激传递到“适应”的手上时,我们观察到了更强的适应效果。但是,当双手在同一空间位置(交叉状态)对齐时,无论哪只手接受适配器和测试刺激,适应的幅度都相似。这些结果表明,即使在触觉方式中,数字信息也自动在外部坐标中编码,表明这种空间参考系是数字处理的固有属性,与感觉方式无关。

更新日期:2020-11-27
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