We are using chronically implanted electrode microarrays for in vivo electrophysiological recordings from rats and mice during social behavior. These arrays are custom-made and were designed by us to allow recordings from many areas of the social brain. Using these arrays, we probe the spatial and temporal distribution of brain activity induced in the social brain by various types of social stimuli. The unique design of our arrays enable us to combine these recordings with optogenetic and pharmacogenetic stimulation protocols and to explore their effect on social information processing.