A new P300 no eye-gaze based interface: Geospell

F. Aloise, P. Aricò, F. Schettini, A. Riccio, M. Risetti, S. Salinari, D. Mattia, F. Babiloni, F. Cincotti

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Brain Computer Interface (BCI) is an alternative communication system which allows users to send commands and/or messages toward the outside not crossing the normal output channels of the brain, but conveying these outputs from the human brain to a computer (Wolpaw et al., 2002). In an EEG-based BCI messages are obtained from brain activity. This study presents a novel P300 based Brain Computer Interface requiring no eye gaze, and so usable in covert attention status, called GeoSpell (Geometric Speller). GeoSpell performances have been compared with those obtained by the subjects with the standard 6 by 6 P300 Speller (P3Speller) matrix which depends on eye gaze (Farwell and Donchin, 1988). A NASA Task Load Index (TLX) workload assessment was employed to provide a subjective rating about the task's workload and satisfaction with respect to both the interfaces (NASA Human Performance Research Group 1987). Results shown comparable workload values for P3Speller and Geospell; this result has an important impact in term of efficiency and satisfaction for the use of the BCI devices. Geospell interface has shown an accuracy comparable with the P3 Speller one but with a lower bit-rate.

Original languageEnglish
Title of host publicationBIOSIGNALS 2011 - Proceedings of the International Conference on Bio-Inspired Systems and Signal Processing
Number of pages6
Publication statusPublished - 2011
EventInternational Conference on Bio-Inspired Systems and Signal Processing, BIOSIGNALS 2011 - Rome, Italy
Duration: Jan 26 2011Jan 29 2011


OtherInternational Conference on Bio-Inspired Systems and Signal Processing, BIOSIGNALS 2011


  • Brain computer interface
  • Covert attention
  • Electroencephalogram (EEG)
  • Eye tracker
  • P300
  • Workload

ASJC Scopus subject areas

  • Signal Processing
  • Biomedical Engineering


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