Language-model assisted brain computer interface for typing: A comparison of matrix and rapid serial visual presentation

Mohammad Moghadamfalahi, Umut Orhan, Murat Akcakaya, Hooman Nezamfar, Melanie Fried-Oken, Deniz Erdogmus

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Noninvasive electroencephalography (EEG)-based brain-computer interfaces (BCIs) popularly utilize event-related potential (ERP) for intent detection. Specifically, for EEG-based BCI typing systems, different symbol presentation paradigms have been utilized to induce ERPs. In this manuscript, through an experimental study, we assess the speed, recorded signal quality, and system accuracy of a language-model-Assisted BCI typing system using three different presentation paradigms: A 4 7 matrix paradigm of a 28-character alphabet with row-column presentation (RCP) and single-character presentation (SCP), and rapid serial visual presentation (RSVP) of the same. Our analyses show that signal quality and classification accuracy are comparable between the two visual stimulus presentation paradigms. In addition, we observe that while the matrix-based paradigm can be generally employed with lower inter-Trial-interval (ITI) values, the best presentation paradigm and ITI value configuration is user dependent. This potentially warrants offering both presentation paradigms and variable ITI options to users of BCI typing systems.

Original languageEnglish (US)
Article number7058364
Pages (from-to)910-920
Number of pages11
JournalIEEE Transactions on Neural Systems and Rehabilitation Engineering
Issue number5
StatePublished - Sep 1 2015


  • Brain-computer interface
  • P300
  • RSVP keyboard
  • event-related potential
  • matrix speller

ASJC Scopus subject areas

  • Rehabilitation
  • General Neuroscience
  • Internal Medicine
  • Biomedical Engineering


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