基于疊加原理的合成穩(wěn)態(tài)視覺誘發(fā)電位
[Abstract]:To test the scientific hypothesis that the steady-state visual evoked potential (SSVEP),) induced by high stimulus rate can be regarded as the linear superposition of transient visual evoked potential (t VEP) induced by low stimulus rate. Visual evoked potential (VEP),) was recorded in 10 healthy adults under different stimulus rates (47.1g / 7 7.7g / L 8.39.1g / 10 11.1L 12.5U 14.316.7 / 2025 rev/s) by using mode reversal visual stimulation. Then t VEP induced by low stimulus rate (4 rev/s) and its amplitude-phase adjusted waveforms were synthesized with convolution of stimulus sequence corresponding to SSVEP, at high stimulus rate, respectively. Hotelling T2 test was used to compare the similarities and differences between the synthetic SSVEP and the recorded SSVEP waveforms under the conditions of each t VEP template. The results showed that when t VEP was used as template, there was no significant difference between the SSVEP synthesized based on linear superposition principle and the actual record in the range of 7.1 rev/s stimulation rate (P0.05). In the range of 10 ~ 25 rev/s stimulation rate, there was statistical difference (P0.05), and the error between the two increased with the increase of stimulus rate. After adjusting the amplitude and phase of t VEP template, there was no statistical difference between synthetic and measured SSVEP (P0.05), and the error between them decreased significantly, and remained stable in the range of measured stimulus rate. The results show that there are differences in transient evoked responses under different stimulus rates. The hypothesis of linear superposition between steady-state and transient evoked potentials depends on the measurement of transient evoked potentials at different stimulus rates.
【作者單位】: 南方醫(yī)科大學(xué)生物醫(yī)學(xué)工程學(xué)院;
【基金】:國家自然科學(xué)基金(61172033,61271154)
【分類號】:R318
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