||With the intensity of the competitive market, the emotional needs of modern society have substantially increased, and people have begun to change from being functionally oriented to addressing needs at a psychological level. The use of any product not only produces a single mood, but there are a variety of emotions which can co-exist, of which contrast emotions cause a relatively larger ripple effect, and can surprise the user and leave a deep impression.
The objective of this study is to explore the impact of "diachronic contrast emotion" on comprehensive evaluation during the process of utilization through the "diachronic" contrast emotion produced by the product before and after use, and then to employ the results for product design models. This study collected, surveyed and organized diachronic case examples, and then induced structural concepts through cluster analysis. Twelve lighting design samples were used, and an emotional questionnaire and brainwave measurement were implemented to perform an in-depth study of the relationship between contrast emotions and the comprehensive evaluation.
The results show that: (1) Diachronic emotions can divided into four groups – those which spread out after decisions were made, those which produce a return after a long period of paying out, those in which thought and reality are different, and those in which the results are unexpected. (2) The type of samples in which the results were unexpected produced strong contrast emotions before and after use; the type of samples which spread out after decisions were made resulted in the highest comprehensive evaluations before and after use. (3) Brainwave measurements and an emotional indicator show that emotions were significantly elevated before and after use of the sample. The type of samples which spread out after decisions were made resulted in a relatively higher level of excitement, whereas those which produced a return after a long period of paying out produced a lower level of excitement. (4) Diachronically emotionally contrasting samples excite feelings of “surprise” prior to use, thereby investing the product with an “innovative” feel. If people feel “surprise” before using a product, “contentment” can raise the level of “user satisfaction”. And if a person feels “happy” after using a sample, the sample is seen as being more “innovative” and “satisfying”.