School of Psychology, Shaanxi Normal University, Xi'an, China.
Faculty of Psychology, Southwest University, Chongqing, China.
Psych J. 2023 Aug;12(4):479-490. doi: 10.1002/pchj.640. Epub 2023 Mar 14.
Duration perception can be heavily distorted owing to repetitive exposure to a relatively long or short sensory event, often causing a duration aftereffect. Here, we used a novel procedure to show that adaptations to both single and average durations produced the duration aftereffect. Participants completed a duration reproduction task (Experiment 1) or a duration category rating task (Experiment 2) after long-term adaptations to a stimulus of medium duration and to stimuli of averagely medium duration. We found that adaptations to both single and average durations resulted in duration aftereffects. The simultaneously recorded functional magnetic resonance imaging (fMRI) data revealed that the reduction in neural activity due to long-term adaptation to single duration was observed in the right supramarginal gyrus (SMG) of the parietal lobe, while adaptation to average duration resulted in fMRI adaptations in the left postcentral gyrus (PCG) and middle cingulate gyrus (MCG). At the individual level, the magnitude of the behavioral aftereffect was positively correlated with the magnitude of fMRI adaptation in the right SMG after adaptation to single duration, while there were no significantly positive correlations between the behavioral aftereffect and fMRI adaptations in the left PCG and MCG. These results suggest that there are different neural mechanisms for aftereffects caused by adaptations to single and average durations.
时长感知会因反复暴露于相对较长或较短的感觉事件而受到严重扭曲，通常会导致时长后效。在这里，我们使用一种新的程序表明，对单个时长和平均时长的适应都会产生时长后效。参与者在长期适应中等时长的刺激和平均时长的刺激后完成时长再现任务（实验 1）或时长类别评分任务（实验 2）。我们发现，对单个时长和平均时长的适应都会导致时长后效。同时记录的功能磁共振成像（fMRI）数据显示，由于对单个时长的长期适应而导致的神经活动减少发生在顶叶右缘上回（SMG），而对平均时长的适应导致左侧中央后回（PCG）和中扣带回（MCG）的 fMRI 适应。在个体水平上，对单个时长的适应引起的行为后效的幅度与适应后右侧 SMG 中的 fMRI 适应幅度呈正相关，而对左侧 PCG 和 MCG 中的 fMRI 适应与行为后效之间没有显著的正相关。这些结果表明，适应单个时长和平均时长引起的后效具有不同的神经机制。
