Another fact you may hear is that dominant monkeys, of at least some very dominance-prone species, have more serotonin. Just increasing the serotonin in a monkey of this type makes it dominant over its fellows given a drug that decreases serotonin. Putting a monkey of this type at the top of a dominance hierarchy increases the serotonin in its brain. Removing it from that status decreases serotonin. Here is another reason why doctors may want to increase your serotonin—to help you be more dominant and successful in a dominance-oriented society.
