Discrimination of Velocity and Spectral Composition of a Sound Stimulus during Its Movement in the Vertical Plane |
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Authors: | M. Yu. Agaeva N. I. Nikitin |
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Affiliation: | (1) Russian Academy of Sciences, Pavlov Institute of Physiology, St. Petersburg, 199034, Russia |
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Abstract: | Differential sensitivity to the velocity of a sound source image in the vertical plane was studied by using two signals with different spectral bandwidths: 0.25–4 kHz (signal 1) and 4–12.5 kHz (signal 2). Five subjects were tested. Sequential switching of loudspeakers with similar frequency characteristics simulated movement of a sound source. Differential velocity thresholds were determined for two reference velocities: 58 and 115°/s. Significant differences in the absolute values of these thresholds were found for signals with different spectral compositions. The threshold for signal 1 (0.25–4.0 kHz) exceeded that for signal 2 (4.0–12.5 kHz) twofold at 58°/s and 1.6-fold at 115°/s. |
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