標題: Polychromatic SSVEP stimuli with subtle flickering adapted to brain-display interactions
作者: Chien, Yu-Yi
Lin, Fang-Cheng
Zao, John K.
Chou, Ching-Chi
Huang, Yi-Pai
Kuo, Heng-Yuan
Wang, Yijun
Jung, Tzyy-Ping
Shieh, Han-Ping D.
分子醫學與生物工程研究所
資訊工程學系
光電工程學系
Institute of Molecular Medicine and Bioengineering
Department of Computer Science
Department of Photonics
關鍵字: brain-computer interface;interactive display systems;steady-state visual evoked;potentials;visual stimuli;polychromatic;subtle flickering;canonical correlation analysis
公開日期: 二月-2017
摘要: Objective. Interactive displays armed with natural user interfaces (NUIs) will likely lead the next breakthrough in consumer electronics, and brain-computer interfaces (BCIs) are often regarded as the ultimate NUI-enabling machines to respond to human emotions and mental states. Steady-state visual evoked potentials (SSVEPs) are a commonly used BCI modality due to the ease of detection and high information transfer rates. However, the presence of flickering stimuli may cause user discomfort and can even induce migraines and seizures. With the aim of designing visual stimuli that can be embedded into video images, this study developed a novel approach to induce detectable SSVEPs using a composition of red/green/ blue flickering lights. Approach. Based on the opponent theory of colour vision, this study used 32 Hz/40 Hz rectangular red-green or red-blue LED light pulses with a 50% duty cycle, balanced/ equal luminance and 0 degrees/180 degrees phase shifts as the stimulating light sources and tested their efficacy in producing SSVEP responses with high signal-to-noise ratios (SNRs) while reducing the perceived flickering sensation. Main results. The empirical results from ten healthy subjects showed that dual-colour lights flickering at 32 Hz/40 Hz with a 50% duty cycle and 180 degrees phase shift achieved a greater than 90% detection accuracy with little or no flickering sensation. Significance. As a first step in developing an embedded SSVEP stimulus in commercial displays, this study provides a foundation for developing a combination of three primary colour flickering backlights with adjustable luminance proportions to create a subtle flickering polychromatic light that can elicit SSVEPs at the basic flickering frequency.
URI: http://dx.doi.org/10.1088/1741-2552/aa550d
http://hdl.handle.net/11536/133188
ISSN: 1741-2560
DOI: 10.1088/1741-2552/aa550d
期刊: JOURNAL OF NEURAL ENGINEERING
Volume: 14
Issue: 1
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