Sonnadara Ranil R, Alain Claude, Trainor Laurel J
Department of Psychology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1.
Brain Res. 2006 Mar 3;1076(1):187-92. doi: 10.1016/j.brainres.2005.12.093. Epub 2006 Feb 17.
Rapid processing of sound location is critical for orienting attention. The present study investigated whether contextually sensitive early neural responses elicited by occasional changes in sound location could be measured. Using an oddball paradigm with stimuli consisting of brief noise bursts whose location was occasionally varied using head-related transfer functions, we found significant enhanced negativities in the event-related potentials elicited by deviant stimuli as early as 25 ms after stimulus onset, in addition to the differences around 125 ms which have previously been reported. Recent research suggests that occasional changes in auditory location information are processed in areas beyond primary auditory cortex. Our data suggest that any such processing is in fact preceded by activation in primary auditory cortex.
声音位置的快速处理对于引导注意力至关重要。本研究调查了是否能够测量由声音位置的偶尔变化引发的上下文敏感早期神经反应。使用一种奇偶数范式，其刺激由短暂的噪声脉冲组成，通过头部相关传递函数偶尔改变其位置，我们发现，早在刺激开始后25毫秒，偏差刺激引发的事件相关电位中就出现了显著增强的负波，此外还有先前报道的约125毫秒左右的差异。最近的研究表明，听觉位置信息的偶尔变化是在初级听觉皮层以外的区域进行处理的。我们的数据表明，实际上任何此类处理之前初级听觉皮层都会被激活。
