Abstract:

For the purpose of finding possible brain activity corresponding to the subjective preference of sound fields, an attempt was made to analyze the effective duration ((tau)[inf e]) of the running autocorrelation function (ACF) in the (alpha)-wave range (8--13 Hz) in both hemispheres. As the sound source, a music motif (Arnold: Sinfornietta of Opus 48, a 5 s Piece of the 3rd movement) was selected. When the temporal factor of the sound fields (the delay time of reflection (Delta)t[inf 1]) is changed, the values of (tau)[inf e] in the (alpha) wave in the left hemisphere correspond well with the subjective preference, but not in the right hemisphere. A long value of (tau)[inf e] in the (alpha) wave indicates the preferred condition. When the reverberation time T[inf sub] is changed, the values of (tau)[inf e] in the (alpha) wave were much longer at the preferred reverberation time [T[inf sub]][inf p]=1.2 s than those at T[inf sub]=0.2 or 6.4 s in the left hemisphere. On the other hand, when the spatial factor of the sound fields (IACC) is changed, the right-hemisphere dominance is achieved by the analyses of the value of (tau)[inf e] in the (alpha) wave (p<0.001).