Localization of Moving Sound Stimuli under Conditions of Spatial Masking

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Resumo

The aim of this study was to investigate spatial masking of noise signals in the delayed motion paradigm. Spatial effects were created by interaural level differences (ILD). Stationary maskers were located laterally or near the head midline, while test signals moved at different velocities from the head midline towards the ears, or in the opposite direction. The masking effect was measured by shifts in the perceived azimuthal positions of the starting and final points of signal trajectories, compared to their positions in silence. The perceived trajectories of all test signals shifted in the opposite direction from the masker. The masking effect was most pronounced in the spatial regions closest to the maskers, and was stronger when the signal moved towards the masker, compared to moving away from it. The final points were perceptually shifted further than the starting points. Signal velocity and masker presentation side (left or right) did not change the degree of masking.

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Sobre autores

E. Petropavlovskaia

Pavlov Institute of Physiology, RAS

Autor responsável pela correspondência
Email: petropavlovskaiae@infran.ru
Rússia, St. Petersburg

L. Shestopalova

Pavlov Institute of Physiology, RAS

Email: petropavlovskaiae@infran.ru
Rússia, St. Petersburg

D. Salikova

Pavlov Institute of Physiology, RAS

Email: petropavlovskaiae@infran.ru
Rússia, St. Petersburg

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2. Fig. 1. The structure of the stimulation epoch. The gray and black lines are stimuli with different movement speeds. The upper two rows illustrate the order of presentation of test signals in silence, the lower two rows in the presence of a masker.

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3. Fig. 2. Perceived trajectories of movement of signals in silence and during masking. A, C — in series with lateral maskers, B — with a central masker. Semicircular arcs are a schematic representation of the anterior sector of the subjective sound space. The scales on the arcs are the angular distance from the median line of the head (azimuth), in degrees. Arrows are the perceived trajectories of the signals. Lines of the same color (gray or black) correspond to the trajectories of the same signal in silence (thin lines) and in masking (bold lines). The numbers near the arrows are the conditional numbering of NT and CT.

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4. Fig. 3. Perceptual shift of the initial and end points of the signal trajectories under masking conditions compared to their presentation in silence, at different calculated distances between the signal and the masker (DIFF).

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5. Fig. 4. The scheme of the relative position of the masker, the starting and ending points of the signals included in the analysis of variance. A — two-factor analysis of the displacement of the central points with lateral maskers (DIFF = 10 dB), B, C — three-factor analysis of the displacement of the central and lateral points under the action of the maskers closest to them (B: DIR = 0 dB) and when the signal and the masker are separated by an estimated angular distance of 90 degrees (C: DIR = 10 dB). On the arrows, the circle corresponds to the beginning of the trajectory, the triangle to the end of the trajectory. If the point is included in the analysis, the corresponding element is indicated in black, if it is not included — in white. The number on the head diagram is the number of the corresponding point in Fig. 2. Below the head is the average value of the displacement of the perceived position of the corresponding point in disguise compared to presentation in silence.

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