"Throughout the process of interaction design, designers must be aware of key aspects in their designs that influence emotional responses in target users. The need for products to convey positive emotions and avoid negative ones is critical to product success. These aspects include positive, negative, motivational, learning, creative, social and persuasive influences to name a few. One method that can help convey such aspects is the use of expressive interfaces. In software, for example, the use of dynamic icons, animations and sound can help communicate a state of operation, creating a sense of interactivity and feedback. Interface aspects such as fonts, color pallet, and graphical layouts can also influence an interface's perceived effectiveness. Studies have shown that affective aspects can affect a user's perception of usability.
Emotional and pleasure theories exist to explain people’s responses to the use of interactive products. These include Don Norman's emotional design model; Patrick Jordan's pleasure model, and McCarthy and Wright's Technology as Experience framework." Sourced from: http://en.wikipedia.org/wiki/Interaction_design#Affective_interaction_design
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