التفاصيل البيبلوغرافية
| العنوان: |
An SSVEP-Based BCI Using High Duty-Cycle Visual Flicker. |
| المؤلفون: |
Lee, Po-Lei1, Yeh, Chia-Lung1, Cheng, John Yung-Sung2, Yang, Chia-Yen3, Lan, Gong-Yau4 |
| المصدر: |
IEEE Transactions on Biomedical Engineering. Dec2011 Part 1 Part 1, Vol. 58 Issue 12, p3350-3359. 10p. |
| مصطلحات موضوعية: |
*HOSPITALS, EVOKED potentials (Electrophysiology), VISUAL evoked response, VISUALIZATION, ELECTROENCEPHALOGRAPHY, BRAIN-computer interfaces, LIGHT emitting diodes |
| مستخلص: |
Steady-state visual-evoked potential (SSVEP)-based brain–computer interfaces (BCIs) have generated significant interest due to their high information transfer rate (ITR). Due to the amplitude–frequency characteristic of the SSVEP, the flickering frequency of an SSVEP-based BCI is typically lower than 20 Hz to achieve a high 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 user's visual discomfort. The proposed design uses LEDs flashing at 13.16 Hz, driven by flickering sequences consisting of repetitive stimulus cycles with a duration T (T = 76 ms). Each stimulus cycle included an ON state with a duration T ON and an OFF state with a duration TOFF ( T = T ON + T OFF), 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 the 25.08-bits/min ITR. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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