In design environment that is growing more emotion oriented, consumers` sensual experiences using the five senses are becoming important means of emotional communication. In this situation, the present study was attempted with recognizing the necessity for brand design to draw out consumers` emotion by providing synesthetic experiences that stimulate their senses of hearing, touch, taste and smell rather than appealing only to the sense of vision. Taking note of the effect of synesthetic images, which is most effective in refreshing human emotion, we reviewed theories related to synesthesia and proposed a synesthetic visualization method, which applies the pattern of synesthetic metaphor connoted by brand names to brand logo type design. Furthermore, through testing hypothesis, we clarified the correlation with consumers` attitude response to synesthetically expressed logo type and, by doing so, proved the effects and values of synesthetic expression and provided strategic guidelines for design expression. The contents of this study are as follows. First, this study presented the necessity for introducing the theories of synesthesia to brand logo design, one of brand design elements, and suggested how to use the theories. Second, this study prepared grounds for the use of synesthetic design expression through the emotional restructuring of senses. In addition, we determined the correlation between the attributes of sense and logo type and, based on the correlation, established a synesthetic visualization method of brand logo type through sensual synthesis, and prepared experimental stimuli using the method. Lastly, this study evaluated the effect of the method by analyzing the influential relation between synesthetic experimental stimuli (logo designs) prepared through sensual synthesis and consumers` attitude response (brand emotion, brand recognition and brand attitude). Methodologically, we explored the cognitive characteristics of senses and, from the results, extracted sensual emotional factors. The extracted emotional factors are variables that can affect people`s emotional response, and were composed of scales that can indicate the degree of sensual stimuli. Then, in order to extract the formative control variables (representative attributes) of logo type corresponding to the emotional factors, 40 font styles, which were selected according to given criteria, were presented and a preliminary questionnaire survey was conducted with design specialists in order to determine the correlation between the emotional factors and the forms of the font styles. When the results of the survey were analyzed, a significant correlation was found between the emotional factors and the forms of the font styles. The extracted formative control variables of logo types were inserted into mean values obtained from evaluating the emotional factors of three hypothetical brand names, and two experimental stimuli were designed for each brand name according to the level of synesthetic expression
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