Baumann Oliver, Greenlee Mark W
Institute for Experimental Psychology, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany.
Cereb Cortex. 2007 Jun;17(6):1433-43. doi: 10.1093/cercor/bhl055. Epub 2006 Aug 23.
Real-life moving objects are often detected by multisensory cues. We investigated the cortical activity associated with coherent visual motion perception in the presence of a stationary or moving auditory noise source using functional magnetic resonance imaging. Twelve subjects judged episodes of 5-s random-dot motion containing either no (0%) or abundant (16%) coherent direction information. Auditory noise was presented with the displayed visual motion that was moving in phase, was moving out-of-phase, or was stationary. Subjects judged whether visual coherent motion was present, and if so, whether the auditory noise source was moving in phase, was moving out-of-phase, or was not moving. Performance was greatest for a moving sound source that was in phase with the visual coherent dot motion compared with when it was in antiphase. A random-effects analysis revealed that auditory motion activated extended regions in both cerebral hemispheres in the superior temporal gyrus (STG), with a right-hemispheric preponderance. Combined audiovisual motion led to activation clusters in the STG, the supramarginal gyrus, the superior parietal lobule, and the cerebellum. The size of the activated regions was substantially larger than that evoked by either visual or auditory motion alone. The congruent audiovisual motion evoked the most extensive activation pattern, exhibiting several exclusively activated subregions.
现实生活中的移动物体通常是通过多感官线索来检测的。我们使用功能磁共振成像研究了在存在静止或移动的听觉噪声源的情况下，与连贯视觉运动感知相关的皮层活动。12名受试者对包含无（0%）或丰富（16%）连贯方向信息的5秒随机点运动片段进行判断。听觉噪声与显示的视觉运动同时呈现，视觉运动呈同相移动、异相移动或静止状态。受试者判断是否存在视觉连贯运动，如果存在，听觉噪声源是同相移动、异相移动还是不移动。与异相时相比，与视觉连贯点运动同相的移动声源的表现最佳。随机效应分析显示，听觉运动激活了双侧大脑半球颞上回（STG）的扩展区域，右侧半球占优势。视听联合运动导致在STG、缘上回、顶上小叶和小脑中出现激活簇。激活区域的大小明显大于单独由视觉或听觉运动引起的激活区域。一致的视听运动诱发了最广泛的激活模式，表现出几个单独激活的子区域。
