Studying the Effect of the Pre-Stimulation Paradigm on Steady-State Visual Evoked Potentials with Dynamic Models Based on the Zero-Pole Analytical Method

• 来源期刊: 清华大学学报自然科学版（英文版）
• 年，卷（期）: 2020,（3）
• 页码范围: 435-446
• 页数: 12页
• 语种: 英文
• DOI: 10.26599/TST.2019.9010028

摘要

This study explored methods for improving the performance of Steady-State Visual Evoked Potential (SSVEP)-based Brain-Computer Interfaces (BCI),and introduced a new analytical method to quantitatively analyze and reflect the characteristics of SSVEP.We focused on the effect of the pre-stimulation paradigm on the SSVEP dynamic models and the dynamic response process of SSVEP,and performed a comparative analysis of three pre-stimulus paradigms (black,gray,and white).Four dynamic models with different orders (second-and third-order) and with and without a zero point were used to fit the SSVEP envelope.The zero-pole analytical method was adopted to conduct quantitative analysis on the dynamic models,and the response characteristics of SSVEP were represented by zero-pole distribution characteristics.The results of this study indicated that the pre-stimulation paradigm affects the characteristics of SSVEP,and the dynamic models had good fitting abilities with SSVEPs under various types of pre-stimulation.Furthermore,the zero-pole characteristics of the models effectively characterize the damping coefficient,oscillation period,and other SSVEP characteristics.The comparison of zeros and poles indicated that the gray pre-stimulation condition corresponds to a lower damping coefficient,thus showing its potential to improve the performance of SSVEP-BCIs.