Anisotropy in tactile time perception
Anisotropy in tactile time perception
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DOI：
10.1016/j.cortex.2020.03.011
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发表时间：
2020-07-01
期刊：
影响因子：
3.6
通讯作者：
Longo, Matthew R.
中科院分区：
文献类型：
--
作者：
Hidaka, Souta;Tame, Luigi;Longo, Matthew R.
自 19 世纪以来，人们就开始研究触摸时的空间扭曲。例如，施加到手背的两次触摸，与与近远轴（沿着手）对齐时相比，与中间外侧轴（即，穿过手）对齐时感觉距离更远。对我们感觉受体的刺激通常是动态的，其中空间和时间输入紧密相互作用以建立我们的感知。例如，身体上较大的触觉刺激被认为比较小的刺激持续时间更长。考虑到触摸中空间和时间之间的这种联系，我们研究了时间感知中是否存在类似于上述各向异性的触觉各向异性。在这种情况下，当两次触摸与手背的近远轴对齐时，两次触摸开始之间的感知持续时间应该更长。为了检验这个假设，我们要求参与者判断两个触觉时间序列中哪一个感觉更长，沿着和跨越背部具有相同的空间间隔。观察到时间感知的明显各向异性：手上的时间间隔被感知为比沿着手的时间间隔更长。与空间各向异性一致，时间各向异性没有出现在手的手掌侧，这表明时间各向异性是基于感知过程而不是自上而下的调节，例如注意力或决策/反应偏差。然而，与我们的预测相反，我们发现时间和空间各向异性的大小之间没有相关性。我们的结果证明了一种新型的触摸时间错觉，其本质上与先前报道的空间各向异性惊人相似。因此，质量上相似的扭曲体感表征似乎是触摸的时间和空间处理的基础。
Spatial distortions in touch have been investigated since the 19th century. For example, two touches applied to the hand dorsum feel farther apart when aligned with the mediolateral axis (i.e., across the hand) than when aligned with the proximodistal axis (along the hand). Stimulations to our sensory receptors are usually dynamic, where spatial and temporal inputs closely interact to establish our percept. For example, physically bigger tactile stimuli are judged to last longer than smaller stimuli. Given such links be- tween space and time in touch, we investigated whether there is a tactile anisotropy in temporal perception analogous to the anisotropy described above. In this case, the perceived duration between the onset of two touches should be larger when they are aligned with the mediolateral than with the proximodistal axis of the hand dorsum. To test this hypothesis, we asked participants to judge which of two tactile temporal sequences, having the same spatial separation along and across the dorsum, felt longer. A clear anisotropy of the temporal perception was observed: temporal intervals across the hand were perceived as longer than those along the hand. Consistent with the spatial anisot- ropy, the temporal anisotropy did not appear on the palm side of the hand, indicating that the temporal anisotropy was based on perceptual processes rather than top -down mod- ulations such as attentional or decisional/response biases. Contrary to our predictions, however, we found no correlation between the magnitudes of the temporal and spatial anisotropies. Our results demonstrated a novel type of temporal illusion in touch, which is strikingly similar in nature to the previously reported spatial anisotropy. Thus, qualita- tively similar distorted somatosensory representations appear to underlie both temporal and spatial processing of touch.