"I love it. I just don't know why." This quote by Norman demonstrates the 3 categories we use to explain why good design makes us happy. Essentially, "it's all about fun..", but to successfully achieve this, a product must be both beautiful and functional.
'Visceral' is the experience. Its what makes us happy or sad. Norman describes it as the biology of design in our body. it is our brain reacting to different aspects such a bright colours or font types. An example of visceral processing is the 1960's e-type jaguar which is stunningly beautiful but constantly breaks down and falls apart but people still love it because it is beautiful.
'Behavioural' is all about feeling in control. The designer wants you to have control of the product. for example the teapot from the four seasons in chicago or driving a high performance super car around a tight bend. Thee products feel with you and have emotion.
'Reflective' is the way Norman describes our "super ego", where we have no control over ourselves. It's all about our image - perfect example is the Hummer. It's a car that defines one's status; seeking and gaining that attention through a product.
Norman also demonstrates through a problem solving experiment he conducted that being happy whilst completing a task can effectively make a task easier to complete. Throughout the presentation Norman constantly mentions that the experience of design and the relationship between a product and user should be fun and i totally agree, "Its all about fun"