Key points from article :
In tube test the mice who shoves the most wins the dominance game.
Scientists used optogenetics to trigger the dmPFC region of a low-ranking mouse's brain.
The dorsomedial prefrontal cortex is associated with "effortful behavior" and "social dominance."
Stimulated low ranking mice won almost every contest.
In some mice the winner effect continued after light stimulation stopped.
The study was published in the Science journal.
