I took the permission to editorialize the title to better reflect what this is about. The original title is "Subliminal Probing for Private Information via EEG-Based BCI Devices", where EEG is "electroencephalography", and BCI is "brain computer interface". This work follows the proof-of-concept presented at USENIX in 2012 and titled (less obscurely) "On the Feasibility of Side-Channel Attacks with Brain-Computer Interfaces" [1].
[1] http://intelli-sec.cs.berkeley.edu/papers/Usenix12_EEGattack...