P300-based brain-computer interface: The effect of the stimulus position in a stimulus train
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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.
Keywordsbrain-computer interface event-related potential P300 wave N1 wave first stimulus single-trial
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- 7.Shishkin, S.L., Ganin, I.P., Basyul, I.A., and Kaplan, A.Ya., Brain-Computer Interface Baced on a P300 Wave: An N1 Wave and the Problem of Distractors, Materialy XV mezhdunarodnoi konf. po neirokibernetike (Proc. XV Int. Conf. Neurocybernetics), pp. 23–25.Google Scholar
- 19.Ganin, I.P., N1 Component of Potentials of the Brain Cortex and Spatial Factors in a P300-Based Brain-Computer Interface, Tezisy dokl. XIV nauchn. shkoly-konf. molodykh uchenykh po fiziologii vysshei nervnoi deyatel’nosti i neirofiziologii (Abstracts XIV Sci. Workshop on the Physiology of Higher Nervous Activity and Neurophysiology), Moscow, 2010, p. 37.Google Scholar
- 20.Ganin I.P., Shishkin S.L., and Kaplan A.Ya., A P300 BCI with Stimuli Presented on Moving Objects, Proc. Fifth Int. BCI Conf. 2011, 2011, p. 308.Google Scholar
- 25.Kaplan, A.Ya. and Shishkin, S.L., RF Patent 2011122085, 2011.Google Scholar