From what I can see, these scientists stiumulated the thalamus and the "dorsomedial prefrontal cortex" and this increased the mice's success rates when competing.
Social dominance in mice depends on their history of winning in social contests. Zhou et al. found that this effect is mediated by neuronal projections from the thalamus to a brain region called the dorsomedial prefrontal cortex. Selective manipulation of synapses driven by this input revealed a causal relationship between circuit activity and mental effort–based dominance behavior. Thus, synapses in this pathway store the memory of previous winning or losing history.
From: http://science.scien...nt/357/6347/162
I wonder, can this be repeated in humans using tDCS ?