The effect of exposure to asynchronous audio, visual, and tactile stimulus combinations on the perception of simultaneity
The effect of exposure to asynchronous audio, visual, and tactile stimulus combinations on the perception of simultaneity
复制标题
DOI：
10.1007/s00221-007-1253-0
复制
发表时间：
2008-04-01
影响因子：
2
通讯作者：
Harris, Laurence R.
中科院分区：
文献类型：
--
作者：
Harrar, Vanessa;Harris, Laurence R.
关于事件的信息需要不同的时间来处理，这取决于事件激活的感觉系统。然而，尽管光和声音的处理时间的变化，短暂呈现的音频/视觉刺激的主观真实性（PSS）点通常接近真实性。在这里，我们确认，实现这一目标的听觉/视觉刺激对的一致性恒定机制是适应性的，并扩展到其他多模态组合的调查。我们测量了在重复暴露于这些对中的每一个之前和之后的三种刺激组合（声/光、声/触摸和光/触摸）的时间顺序判断的PSS和仅可察觉差异（JND），这些对中的每一个呈现100 ms的时间间隔（即，九种适应性测试组合）。只有感知的声/光对的一致性受到我们的曝光制度：PSS移动曝光后的时间交错的声/光或光/触摸对，和JND降低曝光后的声/触摸对。在暴露于三种时间交错组合中的任何一种之后，未发现声音/触摸或光/触摸对的PSS或JND的变化。参与者的反应时间（RT）的三个刺激之前和之后，每次适应暴露也进行了测试。在一般情况下，曝光并不影响注意力或处理时间; RT（9个测试）的唯一变化是增加RT的光曝光后，以声/光对与光的领导。我们认为，多感官的声音/光处理的神经相关性是由一个单独的，更灵活的连续性恒常性机制比光/触摸或声音/触摸连续性处理系统。
Information about an event takes different amounts of time to be processed depending on which sensory system the event activates. However, despite the variations in processing time for lights and sounds, the point of subjective simultaneity (PSS) for briefly presented audio/visual stimuli is usually close to true simultaneity. Here we confirm that the simultaneity constancy mechanism that achieves this for audio/visual stimulus pairs is adaptable, and extend the investigation to other multimodal combinations. We measured the PSS and just noticeable differences (JNDs) for temporal order judgements for three stimulus combinations (sound/light, sound/touch, and light/touch) before and after repeated exposure to each one of these pairs presented with a 100 ms asynchrony (i.e., nine adapt-test combinations). Only the perception of simultaneity of the sound/light pair was affected by our exposure regime: the PSS shifted after exposure to either a temporally staggered sound/light or light/touch pair, and the JND decreased following exposure to a sound/touch pair. No changes were found in the PSSs or JNDs of sound/touch or light/touch pairs following exposure to any of the three time-staggered combinations. Participants' reaction times (RT) to the three stimuli were also tested before and after each adaptation exposure. In general, exposure did not affect attention or processing time; the only change in RTs (of the 9 tested) was an increased RT for light following exposure to a sound/light pair with light leading. We suggest that the neural correlates of multisensory sound/light processing are resynchronised by a separate, more flexible simultaneity constancy mechanism than the light/touch or the sound/touch simultaneity processing systems.