| Abstrakt: |
In order to produce different subjective spatial impressions, two sound field stimuli were alternately presented with a low and a high magnitude of interaural cross-correlation (IACC). (Subjective diffuseness is the percept for sound fields with the low IACC.) Auditory evoked potentials (AEP) from both temporal areas (T3 and T4) of five normal subjects for each stimulus were recorded. When a bandlimited white noise was presented as a source signal, amplitudes of AEPs over the right cerebral hemisphere were much greater than those over the left, as similar to previous results by several investigators. However, this tendency was only weak, even if a vowel (a) was presented. Furthermore, it is generally found with the two sound signals that (i) for the sound fields with high IACCS, amplitudes of AEPs over the right hemisphere were always greater than those over the left, and that (ii) time differences between the first and the second maxima of AEPs over the right hemisphere were clearly longer than those over the left to the high IACC fields. From these findings, the right cerebral hemisphere is considered to be dominantly operative for the auditory spatial sensation. [ABSTRACT FROM AUTHOR] |
