Hidaka Souta, Higuchi Satomi, Teramoto Wataru, Sugita Yoichi
Department of Psychology, Rikkyo University, 1-2-26, Kitano, Niiza-shi, Saitama 352-8558, Japan.
Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, 2-1-1 Nishitokuta, Yahaba-cho, Shiwa-gun, Iwate 028-3694, Japan.
Acta Psychol (Amst). 2017 Jul;178:66-72. doi: 10.1016/j.actpsy.2017.05.013. Epub 2017 Jun 7.
Studies of crossmodal interactions in motion perception have reported activation in several brain areas, including those related to motion processing and/or sensory association, in response to multimodal (e.g., visual and auditory) stimuli that were both in motion. Recent studies have demonstrated that sounds can trigger illusory visual apparent motion to static visual stimuli (sound-induced visual motion: SIVM): A visual stimulus blinking at a fixed location is perceived to be moving laterally when an alternating left-right sound is also present. Here, we investigated brain activity related to the perception of SIVM using a 7T functional magnetic resonance imaging technique. Specifically, we focused on the patterns of neural activities in SIVM and visually induced visual apparent motion (VIVM). We observed shared activations in the middle occipital area (V5/hMT), which is thought to be involved in visual motion processing, for SIVM and VIVM. Moreover, as compared to VIVM, SIVM resulted in greater activation in the superior temporal area and dominant functional connectivity between the V5/hMT area and the areas related to auditory and crossmodal motion processing. These findings indicate that similar but partially different neural mechanisms could be involved in auditory-induced and visually-induced motion perception, and neural signals in auditory, visual, and, crossmodal motion processing areas closely and directly interact in the perception of SIVM.
运动感知中的跨模态交互研究报告称，在响应动态的多模态（如视觉和听觉）刺激时，包括与运动处理和/或感觉关联相关的脑区在内的多个脑区会被激活。最近的研究表明，声音可以触发对静态视觉刺激的虚幻视觉表观运动（声音诱导的视觉运动：SIVM）：当同时存在交替的左右声音时，在固定位置闪烁的视觉刺激会被感知为横向移动。在此，我们使用7T功能磁共振成像技术研究了与SIVM感知相关的脑活动。具体而言，我们关注SIVM和视觉诱导的视觉表观运动（VIVM）中的神经活动模式。我们观察到，在被认为参与视觉运动处理的枕中区域（V5/hMT），SIVM和VIVM存在共同激活。此外，与VIVM相比，SIVM在颞上区域导致更大的激活，以及V5/hMT区域与听觉和跨模态运动处理相关区域之间的显著功能连接。这些发现表明，听觉诱导和视觉诱导的运动感知可能涉及相似但部分不同的神经机制，并且在SIVM的感知中，听觉、视觉和跨模态运动处理区域中的神经信号紧密且直接地相互作用。
