Deep in Social Intelligence, Daniel Goleman writes:

Until now neuroscience has just studied one brain at once, but now two are being alayszed at once, unveiling a hitherto undreamed-of neural duet between brains as people interact.

In my opinion, you will never get a full picture of the human brain if it's not seen interacting with several other brains. The human brain is really other brains, a collection of brains, many brains at once. One brain tells you has much about itself as one ant tells you about itself and its colony. A good idea of the actual brain can be obtained from this image of a Portugese art work called: Centipede Cinema. 16 brains linked into one box (cinema) is something like what the human brain actually is.