Jaekl Philip M, Harris Laurence R
Centre for Vision Research, York University, Toronto, Ontario, Canada.
Vis Neurosci. 2009 Nov;26(5-6):477-86. doi: 10.1017/S0952523809990289.
We investigated the effect of auditory-visual sensory integration on visual tasks that were predominantly dependent on parvocellular processing. These tasks were (i) detecting metacontrast-masked targets and (ii) discriminating orientation differences between high spatial frequency Gabor patch stimuli. Sounds that contained no information relevant to either task were presented before, synchronized with, or after the visual targets, and the results were compared to conditions with no sound. Both tasks used a two-alternative forced choice technique. For detecting metacontrast-masked targets, one interval contained the visual target and both (or neither) intervals contained a sound. Sound-target synchrony within 50 ms lowered luminance thresholds for detecting the presence of a target compared to when no sound occurred or when sound onset preceded target onset. Threshold angles for discriminating the orientation of a Gabor patch consistently increased in the presence of a sound. These results are compatible with sound-induced activity in the parvocellular visual pathway increasing the visibility of flashed targets and hindering orientation discrimination.
我们研究了视听感觉统合对主要依赖小细胞处理的视觉任务的影响。这些任务包括：（i）检测元对比掩蔽目标；（ii）辨别高空间频率Gabor斑块刺激之间的方向差异。在视觉目标之前、与之同步或之后呈现不包含与任何一项任务相关信息的声音，并将结果与无声条件进行比较。两项任务均采用二选一强制选择技术。对于检测元对比掩蔽目标，一个间隔包含视觉目标，两个（或两个都不）间隔包含声音。与无声音出现或声音起始先于目标起始时相比，50毫秒内的声音-目标同步降低了检测目标存在的亮度阈值。在有声音的情况下，辨别Gabor斑块方向的阈值角度持续增加。这些结果与小细胞视觉通路中声音诱发的活动增加闪光目标的可见性并阻碍方向辨别相一致。
