| An SSVEP ¿ Based BCI Using High Duty-Cycle Visual Flicker. | |
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MedLine Citation:
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PMID: 21788179 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Steady-state visual evoked potential-based brain computer interfaces (SSVEP-based BCIs) have generated significant interest due to their high information transfer rate (ITR). Due to the amplitude-frequency characteristic of SSVEP, the flickering frequency of an SSVEP-based BCI is typically lower than 20 Hz to achieve high signal-to-noise ratio (SNR). However, a visual flicker with a flashing frequency below the critical flicker-fusion frequency often makes subjects feel flicker jerky, and causes visual discomfort. This study presents a novel technique using high duty-cycle visual flicker to decrease users visual discomfort. The proposed design uses light emitting diodes (LEDs) flashing at 13.16 Hz, driven by flickering sequences consisting of repetitive stimulus cycles with a duration of T (T = 76 ms). Each stimulus cycle included an ON state with a duration TON and an OFF state with a duration TOFF (T = TON + TOFF), and the duty cycle, defined as TON/T, varied from 10.5% to 89.5%. This study also includes a questionnaire survey, and analyzes the SSVEPs induced by different duty-cycle flickers. An 89.5% duty-cycle flicker, reported as a comfortable flicker, was adopted in a phase-tagged SSVEP system. Six subjects were asked to sequentially input a sequence of cursor commands with 25.08 bits/min ITR. |
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Authors:
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P Lee; C Yeh; Y Cheng; C Yang; G Lan |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-7-22 |
Journal Detail:
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Title: IEEE transactions on bio-medical engineering Volume: - ISSN: 1558-2531 ISO Abbreviation: - Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-7-26 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0012737 Medline TA: IEEE Trans Biomed Eng Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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