Table 1.

Summary of 15 brain-to-brain interfacing studies.

BCI Device	BCI Method	CBI Device	CBI Method	Collaboration Type	Collaboration Model	References
(Neuroimaging)		(Stimulation)
EEG	MI	tMS	Visual Cortex	Direct Unidirectional	1:1 (Human:Human)	Grau et al., 2014
			Motor Cortex	Direct Unidirectional	1:1 (Human:Human)	Rao et al., 2014, Rajesh et al., 2020
				Indirect Bidirectional	1:1 (Human:Human)	Mashat et al., 2017
		ICM	Somatosensory Cortex	Direct Unidirectional	1:1 (Human:Rodent)	Yu et al., 2014, Zhang et al., 2019
		tFUS	Somatosensory Cortex	Direct Unidirectional	1:1 (Human:Human)	Lee et al., 2017
	SSVEP	tMS	Visual Cortex	Indirect Bidirectional	1:1 (Human:Human)	Stocco et al., 2015
					N:1 (Human:Human)	Jiang et al., 2019
		ICM	Antenna	Direct Unidirectional	1:1 (Human:Cockroach)	Li and Zhang, 2016
			Nigrostriatal Pathway	Direct Unidirectional	1:1 (Human:Rodent)	Koo et al., 2017
		tFUS	Motor Cortex	Direct Unidirectional	1:1 (Human:Rodent)	Yoo et al., 2013
ICM	Motor Cortex	ICM	Somatosensory Cortex	Direct Unidirectional	1:1 (Rodent:Rodent)	Pais-Vieira et al., 2013
	Somatosensory Cortex	ICM	Somatosensory Cortex	Indirect Bidirectional	N:N (Rodent:Rodent)	Pais-Vieira et al., 2015
Optogenetics	Nucleus Incertus	Optogenetics	Nucleus Incertus	Direct Unidirectional	1:1 (Rodent:Rodent)	Lu et al., 2020