Asymmetry and spatial specificity of auditory aftereffects following adaptation to signals simulating approach and withdrawal of sound sources
| Autor: | E. S. Malinina |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
medicine.medical_specialty
Communication genetic structures Physiology Broadband noise business.industry media_common.quotation_subject Adaptation (eye) Impulse (physics) Audiology Biochemistry Asymmetry Amplitude medicine Sound sources Spatial localization Loudspeaker Psychology business Ecology Evolution Behavior and Systematics media_common |
| Zdroj: | Journal of Evolutionary Biochemistry and Physiology. 50:421-434 |
| ISSN: | 1608-3202 0022-0930 |
| DOI: | 10.1134/s002209301405007x |
| Popis: | The spatial specificity of auditory approaching and withdrawing aftereffects was investigated in an anechoic chamber. The adapting and testing stimuli were delivered from loudspeakers located in front of the subject at the distance of 1.1 m (near) and 4.5 m (far) from the listener’s head. Approach and withdrawal of the stimuli were simulated by increasing or decreasing the amplitude of a broadband noise impulse sequence. The listeners were asked to determine the direction of movement of the test stimulus following each 5-s adaptation period. The “withdrawal” responses were used for psychometric functions plotting and for quantitative assessment of auditory aftereffect. The data summarized for all 8 participants indicated that the asymmetry of approaching and withdrawing aftereffects depended on spatial localization of the adaptor and the test. The asymmetry of aftereffects was larger when the adaptor and the test were presented from the same loudspeaker (either near or far one). Adaptation to the approach induced a directionally dependent displacement of the psychometric functions relative to the control without the adaptation whereas adaptation to withdrawal did not. The magnitude of approaching aftereffect was greater when the adaptor and the test were located in near spatial domain than when they came from far domain. When the adaptor and the test were presented from different loudspeakers, the magnitude of approaching aftereffect decreased as compared to the same spatial localization but after adaptation to withdrawal it increased. As a result, the directionally dependent displacements of the psychometric functions relative to the control were observed after adaptation both to approach and to withdrawal. The divergence of the psychometric functions obtained after adaptation to approach and to withdrawal at near and far domains was greater under the same localization of the adaptor and the test in comparison to their separate localization. We assume that the peculiarities of approaching and withdrawing aftereffects observed reflect their spatial specificity. It is possible that spatial peculiarities of approaching and withdrawing aftereffects can be associated with specialized mechanisms for analysis of motion at different distance from the subject. |
| Databáze: | OpenAIRE |
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