Brain Waves Synchronize when People Interact (The minds of social species are strikingly resonant): https://www.scientificamerican.com/article/brain-waves-synch...

"... when people converse or share an experience, their brain waves synchronize. Neurons in corresponding locations of the different brains fire at the same time, creating matching patterns ..."

"The experience of “being on the same wavelength” as another person is real, and it is visible in the activity of the brain."

"Synchrony may be a sign of shared cognitive processing ..." "The mouse study suggested another level of meaning for synchrony: it predicts the outcomes of future interactions."