School of Psychology, Shaanxi Normal University, Xi'an 710062, China.
Institute of Psychological Sciences, Hangzhou Normal University, Hangzhou 311121, China.
Brain Res. 2021 Jul 1;1762:147432. doi: 10.1016/j.brainres.2021.147432. Epub 2021 Mar 15.
Adaptation to sensory events of long or short duration leads to a negative aftereffect, in which a new target event (of median duration) following the adaptation will be perceived to be shorter or longer than is actually the case. This illusion has been observed in visual, auditory, and tactile modalities. This study used event-related potentials (ERPs) to examine the tactile duration aftereffect, using the contingent negative variation (CNV) and the late positive component (LPC) as a way to characterize the temporal processes. The tactile duration adaptation was found to induce a significant aftereffect within a somatotopic framework. Moreover, the CNV in the contralateral scalp and the LPC in the fronto-central scalp were both modulated by the tactile duration adaptation. Specifically, adaptation to a short tactile duration increased the CNV and LPC amplitudes, whereas adaptation to a long tactile duration decreased them. This modulation was contingent on the topographic distance between fingers, which was only observed when the adapting and test fingers were consistent or adjacent, but not homologous. In sum, these results reveal a coherent behavioral-electrophysiological link in the somatotopically organized tactile duration aftereffect.
适应长时间或短时间的感觉事件会导致负后效，在适应后出现的新目标事件（中等时长）会被感知为比实际情况更短或更长。这种错觉在视觉、听觉和触觉模态中都有观察到。本研究使用事件相关电位（ERPs）来研究触觉时长后效，使用条件负变（CNV）和晚正成分（LPC）来描述时间过程。在躯体定位框架内，触觉时长适应会引起显著的后效。此外，对侧头皮上的 CNV 和额中央头皮上的 LPC 都受到触觉时长适应的调制。具体来说，适应短时长触觉会增加 CNV 和 LPC 的幅度，而适应长时长触觉会降低它们的幅度。这种调制取决于手指之间的拓扑距离，只有当适应和测试手指一致或相邻时才会观察到，而不是同源的。总之，这些结果揭示了在躯体定位组织的触觉时长后效中存在一致的行为电生理联系。
