Localization of Turn Points in the Rhythmic Movement of Sound Image

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Abstract

The localization of start and turn points in rhythmic sound movement created through the modeling of binaural beats (BB) was investigated. The BB-modeled broadband stimuli consisted of stationary initial and final segments with a section of cyclic motion between them. Spatial effects were induced by changes in the interaural time difference (ITD). During the experiment, subjects assessed the position of the movement trajectory ends or the position of reference points using a graphic tablet. It was discovered that the perception of rhythmic movement of the sound image was significantly influenced by the integrative ability of the binaural auditory system. The results indicated that with instantaneous switching between stationary segments, the perceived positions of the trajectory ends (start point and turn point) matched the positions of the reference points. Conversely, the smooth movement between the same extreme values showed a displacement of the trajectory ends: the turn points were localized further from the reference points compared to the start points, at all trajectory positions in space. Localization of the trajectory end crucially depended on the time that the sound had stayed near the turning point. These patterns were expressed stronger in the central area of the acoustic space compared to the periphery.

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About the authors

L. B. Shestopalova

Pavlov Institute of Physiology of the RAS

Author for correspondence.
Email: shestopalovalb@infran.ru
Russian Federation, Saint Petersburg

E. A. Petropavlovskaya

Pavlov Institute of Physiology of the RAS

Email: shestopalovalb@infran.ru
Russian Federation, Saint Petersburg

D. A. Salikova

Pavlov Institute of Physiology of the RAS

Email: shestopalovalb@infran.ru
Russian Federation, Saint Petersburg

P. I. Letyagin

Pavlov Institute of Physiology of the RAS

Email: shestopalovalb@infran.ru
Russian Federation, Saint Petersburg

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2. Fig. 1. Scheme of interaural delay ΔT and calculated positions of trajectories of binaural sound stimuli. A - horizontally - time (ms), vertically - value of interaural delay (ΔT, μs). B - different positions of cyclic motion trajectories in subjective auditory space

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3. Fig. 2. Perceived trajectories of moving stimuli (arrows) and localisation of the landmarks with ΔT = ±800, ±400 and 0 µs (dashed lines). The sharp end of the arrow shows the localisation of the turn point, the blunt end the localisation of the start point. The scale at the bottom is the azimuth angle in degrees. Negative azimuth values correspond to the left half of the subjective acoustic space, while positive values correspond to the right half of the subjective acoustic space

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4. Fig. 3. Perceived position of start and turn points at different values of ΔT. The X axis shows the types of auditory events, the Y axis shows the localisation of the corresponding sound images (degrees of azimuth). Thin horizontal lines show the perceived position of the referents. Asterisks indicate statistically significant differences between the positions of start and turn points localised near the same landmark

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