We may smile and the dog may wag the tail, but in essence, we have a set program and those programs are similar across individuals in the species.
Antonio DamasioThe emotion is the execution of a very complex program of actions. Some actions that are actually movements, like movement that you can do, change your face for example, in fear, or movements that are internal, that happen in your heart or in your gut, and movements that are actually not muscular movements, but rather, releases of molecules.
Antonio DamasioScott Fitzgerald said famously that "he who invented consciousness would have a lot to be blamed for." But he also forgot that without consciousness, he would have no access to true happiness or even the possibility of transcendence.
Antonio DamasioWhen you experience the emotion of sadness, there will be changes in facial expression, and your body will be closed in, withdrawn. There are also changes in your heart, your guts: they slow down. And there are hormonal changes.
Antonio Damasio