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視覺感知空間分布對SSVEP調(diào)制成分的影響

Effect of spatial distribution of visual perception on intermodulation SSVEP

作者: 杜智超  陳志凱  陳弘達(dá)  高上凱  高小榕 
單位:                      中國科學(xué)院半導(dǎo)體研究所(北京100083)        
關(guān)鍵詞:                     腦-機(jī)接口;穩(wěn)態(tài)視覺誘發(fā)電位;調(diào)制          
分類號:
出版年·卷·期(頁碼):2014·33·4(337-343)
摘要:

目的 研究視覺感知空間分布對穩(wěn)態(tài)視覺誘發(fā)電位(steady state visual evoked potential, SSVEP)調(diào)制成分的影響,為后續(xù)研究SSVEP調(diào)制成分與認(rèn)知的關(guān)系奠定基礎(chǔ)。方法 使用兩種閃爍頻率分別標(biāo)記兩個刺激圖像,設(shè)計并實現(xiàn)了“完全重合”、“左右半分”和“對角四分”三種不同空間分布的腦電實驗。共9名被試參與此次研究。本文計算并比較了3種實驗條件下SSVEP基本成分與調(diào)制成分的信噪比空間分布,并做配對t檢驗。結(jié)果 調(diào)制成分的信噪比在“完全重合”時遠(yuǎn)大于“左右半分”和“對角四分”,且在大部分電極處都具有顯著性差異。后兩種分布下調(diào)制成分非常微弱,并且“對角四分”略高于“左右半分”。結(jié)論 當(dāng)不同頻率的刺激圖像的視覺感知空間交疊時,SSVEP調(diào)制成分強,反之,則弱,且可能與交界區(qū)域有關(guān)。因此在有關(guān)SSVEP調(diào)制成分的研究中,需考慮不同頻率標(biāo)記的刺激圖像的空間分布對其的影響。

Objective To study the relationship between intermodulation components of steady state visual evoked potential (SSVEP) and spatial distribution of visual perception, laying a foundation for follow-up research of cognition related to intermodulation components.Methods This article adopted two flashing frequencies to tag two stimuli respectively, designed and implemented three experiments with different patterns of spatial distributions, which were named Overlap, Halves and Diagonals.Nine subjects voluntarily took part in those experiments.The signal-to-noise ratio (SNR)’s spatial distributions of basic components and intermodulation components were compared under these three experimental conditions with paired t test.Results The intermodulation components’ SNR in Overlap was much larger than the ones in Halves and Diagonals, with significant differences in most of the electrodes.The latter two were both extremely weak, and the Halves’ was slightly higher than the Diagonals’.Conclusions When the stimuli’s spatial distribution is overlap, the intermodulation components of SSVEP are larger, otherwise they are weaker and may be related to the border of the stimuli.Therefore, researches related to intermodulation components of SSVEP need to take the spatial distribution of stimuli labeled with different flashing frequencies into account.

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