Based on the latest developments in neuro-technology, Emotiv has developed a revolutionary new personal interface for human computer interaction. The Emotiv EPOC is a high resolution, neuro-signal acquisition and processing wireless neuroheadset. It uses a set of sensors to tune into electric signals produced by the brain to detect player thoughts, feelings and expressions and connects wirelessly to most PCs. // emotiv.com

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The EPOC is a brain-computer interface based on electroencephalography (EEG) technology. The device is worn on the head, and can sense certain thoughts (Cognitiv suite), emotions (Affectiv), and facial expressions (Expressiv); it also tracks the user’s head motions (back-forth, side-side). The data can be mapped to keystrokes, allowing the EPOC to be used as an interface to various programs. E.g., by connecting the EPOC to Processing and Arduino, you could alter the color of a video display or LED lamp according to your intention or mood, or navigate a robot’s movement with thought commands: “move forward,” “move back,” etc. Cf. NeuroSky, Neural Impulse Actuator.
Update 2010.01.03: GlovePIE 0.41 includes support for the EPOC developer ed.
Update 2010.04.08: EPOC to OSC packets (link)
Update 2010.09.16: EPOC has been hacked (thanks to Larry for the heads-up), providing access to its raw EEG data