Abstract
Synesthetic color perception should be interacted somewhere in the usual processing stream in visual pathway. We could assume in which stage of sensory-perceptual processing synesthesia might be evoked. Thus, by comparing synesthesia types with different sensory aspects but with common synesthetic colors, this study aims to identify in which level of sensory-perceptual processing synesthesia occurs by using various types of stimuli. 2 Subjects who experience synesthetic color in common were presented with 2 types of stimuli respectively. In the case of grapheme-colored synesthesia MA, the result reveals that grapheme-colored synesthesia is influenced by both the low level perception and the high level perception. In colored-hearing syneathesia subject TD, a perception as music rather than recognition of physical aspects of sound stimuli, has a stronger influence on synesthesia, and therefore, it could be inferred that higher level perceptional factors are involved. Since grapheme-colored synesthesia is considered a projector and colored-hearing synesthesia is considered an associator, levels of occurrence where synesthesia are produced might have been different.
