Study on the cerebral activity for the visual disorientation of the spatial movement by functional MRI

眩晕的中心区域尚未阐明。在多种感觉被灌溉的情况下，人们会感到眩晕。本研究旨在阐明眩晕中枢感觉野的中枢机制。为此，我们用功能磁共振成像技术检测了视动刺激时的脑活动。视动刺激的条件有三种，第一种条件是低速视动刺激，第二种条件是高速视动刺激，第三种条件是低速视动刺激和同步热刺激。在功能磁共振成像中，包括MT和MST区在内的颞上回活动增加。右脑被认为是活动的优势。我们检测了在高速视动刺激和同时刺激下大脑的活动。当给予高速视动刺激和同时刺激时，MT、MST区和顶枕区的活动增加。我们预测了在高速视动和并行刺激下，大脑中有视觉识别的场外与眼动有关的场的活动增加。在高速视动刺激和并行视动刺激下，MT、MST区和顶枕区的活动均大于低速视动刺激。我们认为，MT、MST区和顶枕区与人脑视觉空间运动的识别和眩晕的中心区有关。

The central fields of vertigo have not been elucidated. People feel vertiginous sensaton in the condition which the multiple sensation are irrigated. We aimed to elucidate the central mechanism of the central sensational fields of vertigo. For this aim, we examined the activities of the brain during optokinetic stimulation by functional MRI.The conditions of the optokinetic stimulation are three conditions, the first one of the condition is studied with the low speed of the optokinetic stimulation, the second one is with high speed, and the third one is studied with the low speed of the optokinetic stimulation and with the concurrent caloric stimulation. In the functional MRI, the increase of the activities of the superior temporal gyrus including the MT and MST field showed. The domination of the activity was admitted in the right hemisphere. We examined the activities of the brain during the high speed optokinetic stimulation and concurrent stimulation. When the high speed optokinetic stimulation and the concurrent stimulation are given, the activities of the MT and MST field, and parieto-ccipital area increased. We forecast the increase of the activities of the field concerning with the eye movement beside the field with visual recognition in the brain during the high speed optokinetic and concurrent stimulation. The activities of the MT and MST field, and parieto-ccipital area during the high speed optokinetic and concurrent stimulation were greater than those during the low speed optokinetic stimulation. We suppose that the MT and MST field and parieto-ccipital area concern the recognition of the visual spatial movement in the human brain and the central field of vertigo.