Scientists Drove Mice to Bond by Zapping Their Brains With Light The study, a tour de force in bioengineering, comes after two decades of research on brain-to-brain synchrony in people. Video Mice with tiny devices implanted in their brains showed a great affinity to one another in an experiment when the signals were synchronized.CreditCredit...Northwestern University May 25, 2021, 2:30 a.m. ET Late one evening last March, just before the coronavirus pandemic shut down the country, Mingzheng Wu, a graduate student at Northwestern University, plopped two male mice into a cage and watched as they explored their modest new digs: sniffing, digging, fighting a little.