| Frequency and Phase Mixed Coding in SSVEP-Based Brain--Computer Interface. | |
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MedLine Citation:
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PMID: 20729160 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Frequency coding has been the traditional method implemented in steady-state visual evoked potential (SSVEP)-based brain--computer interfaces (BCI). However, it is limited in terms of possible target numbers and, consequently, inappropriate for certain applications involving liquid crystal display (LCD) with multiple stimuli. This paper proposes an innovative coding method for SSVEP that, through a combination of frequency and phase, increases the number of targets, thus it improves the information transfer rate (ITR). With this method, a BCI system with 15 targets was developed using three stimulus frequencies, which is five times as many targets as the traditional method. Additionally, this paper defines the concept of reference phase, and decodes the EEG by means of Fourier coefficient projections onto the reference phase directions. Through the optimization of lead position, reference phase, data segment length, and harmonic components, the average ITR exceeded 60 bits/min in a simulated online test with ten subjects. |
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Authors:
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Chuan Jia; Xiaorong Gao; Bo Hong; Shangkai Gao |
Publication Detail:
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Type: Journal Article Date: 2010-08-19 |
Journal Detail:
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Title: IEEE transactions on bio-medical engineering Volume: 58 ISSN: 1558-2531 ISO Abbreviation: IEEE Trans Biomed Eng Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2010-12-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0012737 Medline TA: IEEE Trans Biomed Eng Country: United States |
Other Details:
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Languages: eng Pagination: 200-6 Citation Subset: IM |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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