What effect does repetition of experience have on the mind?

Neurons wire together accordingly harnessing the emotions and overall sensory experience of it to memory. In essence, it creates momentum. The action has an effect - Karma, It remains in memory, and those two create desire or what you're most likely to do again. Karma, Memory, and Desire therefore are sort of the active software of yourself. Mostly, your experiences won't be too far off from one another for this reason. That is until, through will you intend something new.