Vertical localization and perceptual movement of auditory images were investigated through 8 loudspeakers perpendicularly set up with each loudspeaker 30cm apart. The results obtained by over 20 observers show that the localization was fairly identified for one octave bands of noises with the center frequencies from 2 to 8 kHz and smooth movement of auditory images from low to high was perceived when a stimulus consisting of one octave bands of noises was linearly climbed up with a various movement speed.
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