Interactivity plays a major part in the way we perceive objects and visual material. As Monica mentioned, the “cause and effect” relationship plays a significant role in interactivity. We press a button and some action is performed like when playing a video game. This affects us greatly and can change our perspective on an object, software or any other new form of media. For example: when we interact with a website, sometimes the layout is poorly thought out so we become frustrated with the navigation and have an overall negative experience. Other times our interactivity with an object or software can be positive and even a fun experience. A good example of this would be from a recent video I found where a crew of people turned a set of stairs beside an escalator into a working piano. Each step on the stair is one piano key. When a person puts their weight on a step, it triggers a piano sound to play. This cause and effect relationship greatly influences more people to take the stairs rather than the escalator right beside it. This is due to a more interesting interactive experience with the stairs instead of just stepping onto an escalator and then moving forward and up. The stairs became more fun to use and therefore made more people walk up and down the stairs. If there was no piano function built into the stairs, more people would use the escalator. The point is that making an interaction fun is a very important aspect when it comes to interactivity. People will change their outlook on something if it is fun and offers a more personal payoff.
I suggest you watch the video to get a clear idea of what I’m talking about.
Here is the video: http://www.youtube.com/watch?v=2lXh2n0aPyw