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PubMed · 16189972

Visual spatial attention control in an independent brain-computer interface.

Simon P Kelly·Edmund C Lalor·Ciarán Finucane·Gary McDarby·Richard B Reilly
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Abstract

This paper presents a novel brain computer interface (BCI) design employing visual evoked potential (VEP) modulations in a paradigm involving no dependency on peripheral muscles or nerves. The system utilizes electrophysiological correlates of visual spatial attention mechanisms, the self-regulation of which is naturally developed through continuous application in everyday life. An interface involving real-time biofeedback is described, demonstrating reduced training time in comparison to existing BCIs based on self-regulation paradigms. Subjects were cued to covertly attend to a sequence of letters superimposed on a flicker stimulus in one visual field while ignoring a similar stimulus of a different flicker frequency in the opposite visual field. Classification of left/right spatial attention is achieved by extracting steady-state visual evoked potentials (SSVEPs) elicited by the stimuli. Six out of eleven physically and neurologically healthy subjects demonstrate reliable control in binary decision-making, achieving at least 75% correct selections in at least one of only five sessions, each of approximately 12-min duration. The highest-performing subject achieved over 90% correct selections in each of four sessions. This independent BCI may provide a new method of real-time interaction for those with little or no peripheral control, with the added advantage of requiring only brief training.

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AdultAlgorithmsAttentionCommunication Devices for People with DisabilitiesComputer SystemsDiagnosis, Computer-AssistedElectroencephalographyEvoked Potentials, VisualFeasibility StudiesHumansMiddle AgedSpace PerceptionUser-Computer InterfaceVisual CortexClinical TrialJournal Article

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BibTeXRIS

Simon P Kelly, Edmund C Lalor, Ciarán Finucane, Gary McDarby, Richard B Reilly. 2005. Visual spatial attention control in an independent brain-computer interface.. https://doi.org/10.1109/tbme.2005.851510

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