Think and Spell is a part of an overall goal to research Brain-Computer Interfaces (BCI) for use in everyday environments.
A P300 based BCI is used with a T9 ambiguous keyboard algorithm combined with context-sensitive word selection to reduce the decisions required to ‘type’ a word. This approach can significantly improve accuracies and information transfer rates.
Inverso, S. A., Hawes, N., Kelleher, J., Allen, R., and Haase, K., “Think and Spell: Context-Sensitive Predictive Text for an Ambiguous Keyboard Brain-Computer Interface Speller.” Biomedizinische Technik 49 Suppl. 1:53-54, 2004.