通感是一种认知现象。本文从认知语言学的一个基本命题出发,即人的生理结构及身体活动是决定人的一切认知活动的前提和基础,探讨了通感发生的方向及其认知理据:通感总是用体现身体化特征较多的感知来表达体现身体化特征较少的感知。文章还发现,从视觉向其他感官的感知迁移同样受身体化特征的影响。 Synaesthesia is a cognitive phenomenon. This article starts from a basic proposition of cognitive linguistics, that is, human physiological structure and physical activity are the prerequisites and basis for determining all human cognitive activities. The direction of synaesthesia and its cognitive motivation are discussed: Synaesthetic always With the perception of more physical characteristics reflect the body to reflect the characteristics of less perception. The article also found that the perception from the vision to other senses is also influenced by the physical characteristics.