Volume 30 #2

Contents

1. Results and future trends of sensory perception researches with the use of focused ultrasound
2. Auditory detection and classification of amplitude modulation: psychophysical and electrophysiological data
3. Features of speech describing tactile perceived fragmentary images by teenagers with normal and impaired vision
4. Spatial resolution of human auditory system in case of localization of approaching and withdrawing continuous and broken sound images
5. Age-dependent dynamic of sensitivity to androstenone in females
6. The reactions of the ensemble of the auditory nerve fibers in the growth of loudness and intensity discrimination of the efficient pulses presented before and after the disturb pulses

Localization of sound sources in natural environment is performed both for continuously and brokenly moving sound sources. As a rule the latter ones have rhythmical or quasirhythmical structure, which is typical for biologically significant sound signals, such as steps, speech and animals’ communicative signals. Spatial resolution of the auditory system for brokenly moving sound sources is not defined. In the paper relative differential thresholds of distance were used as a measure of spatial resolution of the auditory system. Main goal of this work was to compare the thresholds in case of continuously and brokenly moving sound images localization, which were made by using two loudspeakers (Altman, Andreeva, 2004). Relative differential thresholds of approaching and withdrawing sound sources perception in psychoacoustic research were 5 and 17% for continuous motion, and 3 and 13% for broken motion, respectively. There were no statistically reliable differences between thresholds for continuously and brokenly moving sound sources. This result allows us to suggest that the processing of information about these two types of movement is realized by means of neuronal structures, which are selectively responsible to the auditory motion and have different time characteristics of integration of acoustical information.

Key words: spatial hearing, localization of moving sound source, spatial resolution, movement of an auditory image, broken motion

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