Bendixen Alexandra, Grimm Sabine, Schröger Erich
Institut Psychologie I, Universität Leipzig, Seeburgstr. 14-20, D-04103 Leipzig, Germany.
Neurosci Lett. 2005 Aug 5;383(3):284-8. doi: 10.1016/j.neulet.2005.04.034. Epub 2005 Apr 26.
Internal clock models postulate a pulse accumulation process underlying timing activities, with more accumulated pulses resulting in longer perceived durations. We investigated whether this accumulation is reflected in the amplitude of event-related brain potentials (ERPs) elicited by auditory stimuli with durations of 400-600 ms. In a duration discrimination paradigm, we found more negative amplitudes to physically identical stimuli when they were judged as longer than the memorized standard duration (500 ms) as compared to being classified as shorter. This sustained negativity was already developing during the first 100 ms after stimulus onset. It could not be explained as a bias to respond with a particular hand (lateralized readiness potential), but rather reflects a processing difference between the tones to be judged as shorter or longer. Our results are in line with models of time processing which assume that higher numbers of accumulated pulses of a temporal processor result in an increase in perceived duration.
生物钟模型假定计时活动背后存在一个脉冲积累过程，积累的脉冲越多，感知到的持续时间就越长。我们研究了这种积累是否反映在由持续时间为400 - 600毫秒的听觉刺激所诱发的事件相关脑电位（ERP）的振幅中。在一个持续时间辨别范式中，我们发现，当物理上相同的刺激被判断为比记忆中的标准持续时间（500毫秒）长时，与被归类为短时相比，其负振幅更大。这种持续的负性在刺激开始后的前100毫秒内就已出现。它不能被解释为用特定一只手做出反应的偏差（侧化准备电位），而是反映了被判断为较短或较长的音调之间的加工差异。我们的结果与时间加工模型一致，该模型假定时间处理器积累的脉冲数量越多，感知到的持续时间就越长。
