Exploring Types and Characteristics of Product Forms 
Incorporating emotional value into products has become an essential strategy for increasing a product's competitive edge in the consumer market. It is therefore important for product manufacturers to understand how products affect consumers' emotions. This study was undertaken to investigate the types and characteristics of household products that elicit pleasurable responses, in particular among young, college-age consumers. The results of the study could suggest the types and characteristics to consider when developing pleasurable products aimed at young consumers.
Chang, Wen-chih and Tyan-Yu Wu. International Journal of Design (2007). Design>User Interface>User Experience>Emotions