The first blog post I wrote for Psychology Today was about dopamine, and since then our smartphones have become even more capable of triggering a "dopamine loop."
It's all about dopamine. Dopamine is a chemical that is found all through our body. In our brains dopamine is involved in a lot of our behavior, including thinking, moving, sleeping, mood, attention, motivation, seeking and reward.
Dopamine causes us to want, desire, seek out, and search. Researchers used to think that dopamine was the “pleasure” chemical. But Kent Berridge's work at the University of Michigan distinguishes between dopamine, the “wanting” system, and the opioid system as the “liking” system. The wanting system propels us to action and the liking system makes us feel satisfied, so we pause our seeking. The wanting system is stronger than the liking system. We seek more than we are satisfied.