Brainloop

4. BCI - Brain–computer interfaces
	4.2. Present-day BCIs   4.2.2. Slow cortical potentials     LSP - language support program

The LSP enables the user to choose a letter or letter combination by a series of two-choice selections.
In each selection, the choice is between selecting or not selecting a set of one or more letters.
The first two selections choose between the two halves of the alphabet, the next two between the two quarters of the selected half, and so on until a single letter is chosen. A backup or erase option is provided.
With this program, users who have two-choice accuracies of 65–90% can write 0.15–3.0 letters/min, or 2– 36 words/h.

4. BCI - Intro
	4.1. Definition and features of a BCI   4.1.1. Dependent and independent BCIs 4.1.2. BCI use is a skill 4.1.3. The parts of a BCI   4.1.3.1. Signal acquisition 4.1.3.2. Signal processing: feature extraction 4.1.3.3. Signal processing: the translation algorithm 4.1.3.4. The output device 4.1.3.5. The operating protocol 4.2. Present-day BCIs   4.2.1. Visual evoked potentials 4.2.2. Slow cortical potentials 4.2.3. P300 evoked potentials 4.2.4. Mu and beta rhythms   4.2.4.1. The Wadsworth BCI 4.2.4.2. The Graz BCI 4.2.5. Cortical neuronal action potentials 4.3. The future of BCI-based communication

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Source: Brain–computer interfaces for communication and control, Clinical Neurophysiology 113 (2002) 767–791, Jonathan R. Wolpaw, Niels Birbaumer, Dennis J. McFarland, Gert Pfurtscheller, Theresa M. Vaughan