脑磁扫描反应与从自相关和双耳互相关函数中得到的因子的关系(英文)

Magnetoencephalographic Responses in Relation to the Factors Extracted from Autocorrelation and Interaural Cross-Correlation Functions

利用脑电磁图示(MEG)的方法对听觉诱发磁场(AEFs)与由自相关系数(ACF)以及由双耳互相关系数(IACF)中导出的因子的关系加以检验.首先,检验ACF,(?)的峰值对AEFs的影响,发现音调的强度与(?)良好相关,而当刺激开始后大约100ms时在左右颞叶上发现的N1m的振幅则随(?)的增加而增大.此结果表明较强声调感的声音导致N1m幅值的增加.此外,对IACC以及τ_(IACC)对AEFs的作用也加以检验,发现人类侧向声音定位的能力随IACC的减小而变差.当IACC为0.95时,N1m幅值随τ_(IACC)的增加而增加,而当IACC为0.5时,τ_(IACC)对N1m幅值的作用不显著.此结果表明侧向声音定位的能力可由N1m的幅值来反映.

Auditory evoked magnetic fields （AEFs） in relation to the factors extracted from autocorrelation function （ACF） and interaural cross-correlation function （IACF） were examined by magnetoencephalography （MEG）. First, the effects of the peak amplitude of the ACF, φ1 , on AEFs were examined. The strength of the pitch corresponded well to φ1. The amplitude of the N1m, which was found above the left and right temporal lobes around 100ms after the stimulus onset, increased with inereasing φ1. The results suggest that stronger pitch sounds lead to an increase in the N1m amplitude. Then, the effects of IACC and τIACC on AEFs were examined. Human lateralization performance deteriorated with decreasing IACC. When the IACC was 0.95, the N1m amplitudes increased with increasing τIACC. However, the effect of τIACC on the N1m amplitudes was not significant when the IACC was 0.5. The results suggest that the lateralization performance is reflected in N1m amplitudes.