提高脉宽调制亮度可减少视觉疲劳并增强稳态视觉诱发电位响应。
Toward a reliable PWM-based light-emitting diode visual stimulus for improved SSVEP response with minimal visual fatigue
- 采用高占空比脉宽调制刺激，降低眼睛疲劳
- 85%占空比时产生最稳定的脑电反应峰值
- 适合长期使用的脑机接口系统设计
稳态视觉诱发电位（SSVEP）因信息传输率高且可通过凝视控制指令，广泛应用于脑机接口和视觉诊断。然而，闪烁视觉刺激易引发眼疲劳，限制长期使用；同时，脉宽调制（PWM）精度不足也影响响应准确性。现有研究尝试提高刺激频率以减轻疲劳，但导致响应性能下降。本文通过定制高精度发光二极管硬件，测试了50%至95%的PWM占空比，对10名受试者进行脑电记录。结果显示，随着占空比增加，所有频率下视觉负担均减轻，85%占空比时出现跨被试一致的最优SSVEP响应峰值，为实际应用中提升稳定性与舒适性提供了可行方案。
原文摘要 · Abstract (English)
Steady state visual evoked response (SSVEP) is widely used in visual-based diagnosis and applications such as brain computer interfacing due to its high information transfer rate and the capability to activate commands through simple gaze control. However, one major impediment in using flashing visual stimulus to obtain SSVEP is eye fatigue that prevents continued long term use preventing practical deployment. This combined with the difficulty in establishing precise pulse-width modulation (PWM) that results in poorer accuracy warrants the development of appropriate approach to solve these issues. Various studies have suggested the usage of high frequencies of visual stimulus to reduce the visual fatigue for the user but this results in poor response performance. Here, the authors study the use of extremely high duty-cycles in the stimulus in the hope of solving these constraints. Electroencephalogram data was recorded with PWM duty-cycles of 50 to 95% generated by a precise custom-made light-emitting diode hardware and tested ten subjects responded that increasing duty-cycles had less visual strain for all the frequency values and the SSVEP exhibited a subject-independent peak response for duty-cycle of 85%. This could pave the way for increased usage of SSVEP for practical applications.
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