Российская академия наук

Demonstration of binaural mechanisms of spatial hearing in the aftereffects of azimuth and radial motion

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Demonstration of binaural mechanisms of spatial hearing in the aftereffects of azimuth and radial motion

I.G. Andreeva

I.M. Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg, Russian Federation, ig-andreeva@mail.ru

Sensory motion aftereffect is the psychophysical phenomenon that consists in the perception change of location and motion of stimuli after adaptation to motion. It is supposed that the reason of the phenomenon is short-time functional adaptive changes of neurons included in sensory analysis of motion (Grantham, 1979; Mather et al., 2008). The magnitude of auditory motion aftereffect is determined by likeness of the motion imitation to real movement and by significance of cues used for model for sound localization (Grantham, 1998; Deas et al., 2008). The motion aftereffect has been observed only when spectra of adapting and test stimuli were matching, in the case of their differences effect has been significantly smaller or has not revealed (Andreeva, Nikolaeva, 2013; Grantham, 1989; Dong et al., 2000). Using narrow-band noises with the central frequency of the spectral areas where different binaural mechanisms were effective, has allowed us to determine the main spectral area in case of localization at various coordinates. A comparison of our data, received in case of the modelling of sound source approach and removal, with the results of the work (Dong et al., 2000) has shown that the azimuth motion aftereffect is more in the magnitude to the center frequency of 0.5 Hz, i.e. the mechanism of interaural differences in time is the most significant for the movement perception.

At the radial motion the effect magnitude dominance for the center frequency of 8 kHz existed only at trends. This has confirmed the well-known fact that the main localization cue to evaluate changes in distances are signal amplitude changes. However, some changes in the amplitude of the signal have not been enough to cause the effect of the same magnitude, as obtained with the use of a model with a fixed trajectory (Malinina, Andreeva, 2012). Along with a marked tendency to the effect increase for high-frequency stimuli, it has been revealed a significant deterioration of subjects’ judgments on radial motion direction for signals with the central frequencies of 2 and 0.5 kHz compared with broadband noise and with a frequency of 8 kHz. This points to an important role of high frequencies in the estimation of distance from location when it is 1-5 meters away from location and confirms our hypothesis about the effectiveness of binaural mechanism of the high-frequency hearing to assess such distances (Andreeva, 2004).

This research was supported by the Russian Foundation for Basic Research, project № 12-04-00214а.

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