Human Physiology

, Volume 38, Issue 2, pp 121–128 | Cite as

P300-based brain-computer interface: The effect of the stimulus position in a stimulus train

  • I. P. Ganin
  • S. L. Shishkin
  • A. G. Kochetova
  • A. Ya. Kaplan
Article

Abstract

The most popular type of brain-computer interfaces (BCIs) are based on the detection of the P300 wave of the evoked potentials appearing in response to a stimulus chosen by the subject. In order to increase the speed of operation of these BCIs, it is possible to decrease the number of repeated stimulus presentations. It is associated with an increase in the relative importance of the response to the first stimulus in a train for correct recognition of the stimulus chosen. Event-related potentials (ERPs) in response to the first stimulus presentations are known to have their own specificity. Particularly, in many cases, the amplitude of the response to the first presentations is enhanced, which makes it very suitable for recognition in a BCI. However, this effect has not been studied to date. In this study, the ERPs recorded in healthy subjects in a standard BCI paradigm (n = 14) with ten presentations of stimuli or during triple-trial (n = 6) and single-trial (n = 6) presentations of stimuli in a modified BCI paradigm with moving objects have been analyzed. In both cases, first presentations of the target stimuli or single-trial presentation of the target stimulus were associated with higher amplitudes of ERPs. The opportunity to use specific differences between the responses to the first or single-trial presentations and the responses to later stimuli during their repeated presentations for improving high-speed operations in the P300-based BCI is discussed.

Keywords

brain-computer interface event-related potential P300 wave N1 wave first stimulus single-trial 

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Copyright information

© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  • I. P. Ganin
    • 1
  • S. L. Shishkin
    • 1
  • A. G. Kochetova
    • 1
  • A. Ya. Kaplan
    • 1
  1. 1.Moscow State UniversityMoscowRussia

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