https://arxiv.org/abs/1809.08632 - BrainNet: A Multi-Person Brain-to-Brain Interface for Direct Collaboration Between Brains
We present BrainNet which, to our knowledge, is the first multi-person non-invasive direct brain-to-brain interface for collaborative problem solving. The interface combines electroencephalography (EEG) to record brain signals and transcranial magnetic stimulation (TMS) to deliver information noninvasively to the brain.
https://www.cia.gov/library/readingroom/docs/CIA-RDP96-00792R000400030001-0.pdf - Experimental Dream Telepathy-Clairvoyance and Geomagnetic Activity