This video is a good introduction to Electroencephalography (EEG). Neurosensors connected to computers will be more common in a sustainable society.

Other resources:
+ OpenBCI http://openbci.com/
+ EEG headsets https://imotions.com/blog/eeg-headset-prices/
+ Lab equipment https://www.ant-neuro.com/products/visor2_xt
+ BCI and OpenViBE Introduction Video: http://openvibe.inria.fr/bci-and-openvibe-introduction-video/