Independence of amplitude-frequency and phase calibrations in an SSVEP-based BCI using stepping delay flickering sequences

Hsiang Chih Chang, Po Lei Lee, Men Tzung Lo, I. Hui Lee, Ting Kuang Yeh, Chun Yen Chang

研究成果: 雜誌貢獻期刊論文同行評審

6 引文 斯高帕斯(Scopus)

摘要

This study proposes a steady-state visual evoked potential (SSVEP)-based brain-computer interface (BCI) independent of amplitude-frequency and phase calibrations. Six stepping delay flickering sequences (SDFSs) at 32-Hz flickering frequency were used to implement a six-command BCI system. EEG signals recorded from Oz position were first filtered within 29-35 Hz, segmented based on trigger events of SDFSs to obtain SDFS epochs, and then stored separately in epoch registers. An epoch-average process suppressed the inter-SDFS interference. For each detection point, the latest six SDFS epochs in each epoch register were averaged and the normalized power of averaged responses was calculated. The visual target that induced the maximum normalized power was identified as the visual target. Eight subjects were recruited in this study. All subjects were requested to produce the "563241" command sequence four times. The averaged accuracy, command transfer interval, and information transfer rate (mean ± std.) values for all eight subjects were 97.38 ± 5.97%, 3.56 ± 0.68 s, and 42.46 ± 11.17 bits/min, respectively. The proposed system requires no calibration in either the amplitude-frequency characteristic or the reference phase of SSVEP which may provide an efficient and reliable channel for the neuromuscular disabled to communicate with external environments.

原文英語
文章編號6112237
頁(從 - 到)305-312
頁數8
期刊IEEE Transactions on Neural Systems and Rehabilitation Engineering
20
發行號3
DOIs
出版狀態已發佈 - 2012

ASJC Scopus subject areas

  • 內科學
  • 神經科學 (全部)
  • 生物醫學工程

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