Department of Robotics, Brain and Cognitive Sciences, Istituto Italiano di Tecnologia Genova, Italy.
Front Integr Neurosci. 2011 Sep 12;5:51. doi: 10.3389/fnint.2011.00051. eCollection 2011.
faster moving stimuli appear to last longer. To test whether this is a general property of sensory systems we asked participants to reproduce the duration of visual and tactile gratings, and visuo-tactile gratings moving at a variable speed (3.5-15 cm/s) for three different durations (400, 600, and 800 ms). For both modalities, the apparent duration of the stimulus increased strongly with stimulus speed, more so for tactile than for visual stimuli. In addition, visual stimuli were perceived to last approximately 200 ms longer than tactile stimuli. The apparent duration of visuo-tactile stimuli lay between the unimodal estimates, as the Bayesian account predicts, but the bimodal precision of the reproduction did not show the theoretical improvement. A cross-modal speed-matching task revealed that visual stimuli were perceived to move faster than tactile stimuli. To test whether the large difference in the perceived duration of visual and tactile stimuli resulted from the difference in their perceived speed, we repeated the time reproduction task with visual and tactile stimuli matched in apparent speed. This reduced, but did not completely eliminate the difference in apparent duration. These results show that for both vision and touch, perceived duration depends on speed, pointing to common strategies of time perception.
众所周知，视觉刺激的感知持续时间受到速度的强烈影响：移动速度较快的刺激看起来持续时间更长。为了测试这是否是感觉系统的一般特性，我们要求参与者复制视觉和触觉条纹以及以可变速度（3.5-15 厘米/秒）移动的视触条纹的持续时间，持续时间为三个不同的时间（400、600 和 800 毫秒）。对于两种感觉模式，刺激速度与刺激的感知持续时间之间的关系非常强烈，触觉刺激比视觉刺激更为明显。此外，视觉刺激的感知持续时间比触觉刺激长约 200 毫秒。如贝叶斯理论所预测，视触刺激的感知持续时间介于单模态估计之间，但复制的双模态精度并未显示出理论上的改善。跨模态速度匹配任务表明，视觉刺激的感知速度快于触觉刺激。为了测试视觉和触觉刺激的感知持续时间差异是否源于其感知速度的差异，我们用视觉和触觉刺激在表观速度上进行匹配，重复了时间复制任务。这减少了，但并没有完全消除感知持续时间的差异。这些结果表明，对于视觉和触觉，感知持续时间取决于速度，这表明时间感知存在共同的策略。
