On the building of binary spelling interfaces for augmentive communication

Mikhail Tregoubov, Niels Birbaumer

Research output: Contribution to journalArticlepeer-review


A criterion for design of optimal binary spelling interfaces (SI)-the average expectation of number of writing steps (trials) required to write one letter-is presented and discussed. This criterion is relevant for practical usage of any menu-oriented alternative communication system, mechanical device or brain-computer-interface, when a user (typically, a patient with devastating neuromuscular handicap) can not create an intended single binary response with an absolute reliability. An algorithm for building of a corresponding binary tree is developed and evaluated. This algorithm is efficient, when selection probabilities have essentially different values (the worst case).

Original languageEnglish
Pages (from-to)300-305
Number of pages6
JournalIEEE Transactions on Biomedical Engineering
Issue number2
Publication statusPublished - Feb 2005


  • Binary spelling interface
  • Brain-computer-interface

ASJC Scopus subject areas

  • Biomedical Engineering


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