Table 4.

Main differences between exogenous and endogenous BCI.

Approach	Brain signals	Advantages	Disadvantages
Exogenous BCI	– SSVEP – P300	– Minimal training – Control signal set-up easily and quickly – High bit rate (60 bits/min) – Only one EEG channel required	– Permanent attention to external stimuli – May cause tiredness in some users
Endogenous BCI	– SCPs – Sensorimotor rhythms	– Independent of any stimulation – Can be operated at free will – Useful for users with sensory organs affected – Suitable for cursor control applications	– Very time-consuming training (months or weeks) – Not all users are able to obtain control – Multichannel EEG recordings required for good performance – Lower bit rate (20–30 bits/min)