The nucleus accumbens is active in aticipation of an aggressive encounter
Ferrari P. F. et al. ( Accumbal dopamine and serotonine in anticipation of the next aggressive episode in rats. Eur. J. of Neurosci. 17, 371-378, 2003) using chronically inserted microdialysis probes to measure the levels of extraneuronal serotonin (5-HT) and dopamine in the nucleus accumbens in rats demonstrate changes in anticipation of an aggressive encounter.
We think the authors overestimate the range of their results.