Researchers create noninvasive interface that directly links human brains

The video discusses a study published in Nature about Brain Net, the first brain-to-brain interface connecting three people for two-way communication using EEG and transcranial magnetic stimulation. In a Tetris-like game, two senders use LED lights to send binary signals to a blindfolded receiver, who uses visual cortex stimulation to make decisions. The study found that three people collaborating were more effective than one, and the system could overcome interference from unreliable players.

In what way did the results of the study demonstrate the effectiveness of three people playing the game together?

What was the outcome when researchers flipped the responses of a sender?