Predictive spelling with a P300-based brain-computer interface: Increasing the rate of communication

Journal Article (Journal Article)

This study compared a conventional P300 speller brain-computer interface (BCI) to one used in conjunction with a predictive spelling program. Performance differences in accuracy, bit rate, selections per minute, and output characters per minute (OCM) were examined. An 8 × 9 matrix of letters, numbers, and other keyboard commands was used. Participants (N = 24) were required to correctly complete the same 58 character sentence (i.e., correcting for errors) using the predictive speller (PS) and the nonpredictive speller (NS), counterbalanced. The PS produced significantly higher OCMs than the NS. Time to complete the task in the PS condition was 12 min 43 s as compared to 20 min 20 sec in the NS condition. Despite the marked improvement in overall output, accuracy was significantly higher in the NS paradigm. P300 amplitudes were significantly larger in the NS than in the PS paradigm, which is attributed to increased workload and task demands. These results demonstrate the potential efficacy of predictive spelling in the context of BCI.

Full Text

Duke Authors

Cited Authors

  • Ryan, DB; Frye, GE; Townsend, G; Berry, DR; Mesa-G, S; Gates, NA; Sellers, EW

Published Date

  • January 1, 2011

Published In

Volume / Issue

  • 27 / 1

Start / End Page

  • 69 - 84

Electronic International Standard Serial Number (EISSN)

  • 1532-7590

International Standard Serial Number (ISSN)

  • 1044-7318

Digital Object Identifier (DOI)

  • 10.1080/10447318.2011.535754

Citation Source

  • Scopus