Nicholas liking and addiction to play video games is behavioral change and unintentional. It is the person's likelihood or perceived behavior that he or she is going to engaged in certain activity because of his interest. Most of the time it becomes addiction and affects other activities. However it is unknowing and unintentional.
Martine is demonstrating an example functional fixedness, a cognitive bias that constrains a person to use an object only in the original function it was intended.
