Faculty of Psychology, Southwest University, Chongqing, China; Key Laboratory of Cognition and Personality (Ministry of Education), Southwest University, Chongqing, China; Center of Studies for Psychology and Social Development, Southwest University, Chongqing, China; Time Psychology Research Center, Southwest University, Chongqing, China.
School of Psychology, Shaanxi Normal University, Xi'an, China.
Behav Brain Res. 2022 Aug 5;431:113950. doi: 10.1016/j.bbr.2022.113950. Epub 2022 Jun 4.
Prolonged adaptation to one duration biases the perception of subsequent durations in a phenomenon known as duration adaptation. There is controversy regarding the neural substrates of the visual duration aftereffect: some researchers have argued that duration adaptation occurs in early visual cortical areas, whereas others have argued for high-level visual areas. Investigation of spatial selectivity of the duration aftereffect could help reveal the neural mechanisms underlying duration adaptation. In the present study, we used event-related potentials (ERPs) to demonstrate spatial selectivity of the visual duration aftereffect in the sub-second range. We measured the duration aftereffect at a 20° adapt-test distance that spanned 10° on either side of fixation. Our results revealed that duration adaptation first affected the N1 ERP component and then influenced the contingent negative variation (CNV) component. Moreover, the CNV component showed position effects in the temporal encoding stage, and the post-stimulus positive component was subject to a duration effect but not a position effect. These findings indicate that sub-second duration coding is closely linked to the early processing of the visual cortex. Moreover, the adaptation not only affects the earlier temporal coding stage, but also the later temporal processing stage.
适应一种时长会使人们对后续时长的感知产生偏差，这种现象被称为时长适应。时长后效的神经基础存在争议：一些研究人员认为时长适应发生在早期视觉皮层区域，而另一些研究人员则认为发生在高级视觉区域。研究时长后效的空间选择性有助于揭示时长适应的神经机制。在本研究中，我们使用事件相关电位（ERP）来证明亚秒时长后效的空间选择性。我们在 20°的适应-测试距离上测量时长后效，该距离在注视点两侧各扩展了 10°。结果表明，时长适应首先影响 N1 ERP 成分，然后影响条件负变（CNV）成分。此外，CNV 成分在时间编码阶段表现出位置效应，而刺激后正成分受到时长效应的影响，但不受位置效应的影响。这些发现表明，亚秒时长编码与视觉皮层的早期处理密切相关。此外，适应不仅影响早期的时间编码阶段，也影响后期的时间处理阶段。
