I am the world and the world is Me - J Krishnamurti

Brain synchronization happens when two people are in dialog with each other.

Neuron populations within one brain were activated simultaneously with similar neuron populations in the other brain when the participants cooperated to complete the task, as if the two brains functioned together as a single system for creative problem-solving," says psychologist Yasuyo Minagawa, from Keio University in Japan.

These phenomena are consistent with the notion of a 'we-mode', in which interacting agents share their minds in a collective fashion and facilitate interaction by accelerating access to the other's cognition, and there is already evidence that some kind of brain synchronization happens when two people are in dialog with each other.

https://www.sciencealert.com/working-on-a-task-with-another-person-changes-your-brain-activity-study-finds