Vatakis Argiro, Spence Charles
Crossmodal Research Laboratory, Department of Experimental Psychology, University of Oxford, UK.
Neurosci Lett. 2006 Sep 11;405(1-2):132-6. doi: 10.1016/j.neulet.2006.06.041. Epub 2006 Jul 18.
We investigated whether changing the frame rate at which speech video clips were presented (6-30 frames per second, fps) would affect audiovisual temporal perception. Participants made unspeeded temporal order judgments (TOJs) regarding which signal (auditory or visual) was presented first for video clips presented at a range of different stimulus onset asynchronies (SOAs) using the method of constant stimuli. Temporal discrimination accuracy was unaffected by changes in frame rate, while lower frame rate speech video clips required larger visual-speech leads for the point of subjective simultaneity (PSS) to be achieved than did higher frame rate video clips. The significant effect of frame rate on temporal perception demonstrated here has not been controlled for in previous studies of audiovisual synchrony perception using video stimuli and is potentially important given the rapid increase in the use of audiovisual videos in cognitive neuroscience research in recent years.
我们研究了改变语音视频片段的呈现帧率（每秒6 - 30帧，fps）是否会影响视听时间感知。参与者使用恒定刺激法，对一系列不同刺激起始异步（SOA）下呈现的视频片段，做出关于哪个信号（听觉或视觉）先呈现的无速度时间顺序判断（TOJ）。时间辨别准确性不受帧率变化的影响，然而，与高帧率视频片段相比，低帧率语音视频片段需要更大的视觉 - 语音超前量才能达到主观同步点（PSS）。此处所证明的帧率对时间感知的显著影响，在以往使用视频刺激的视听同步感知研究中并未得到控制，鉴于近年来视听视频在认知神经科学研究中的使用迅速增加，这可能具有重要意义。
