Mechanisms underlying auditory looming bias: Behavioral perspective

Tag / Zeit: 16.08.2021, 17:40-18:00
Raum: Lehar 3
Typ: Regulärer Vortrag
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Zusammenfassung: Approaching or looming sounds are more salient than receding sounds. In order to study this auditory looming bias, moving sensations are mostly created by intensity changes, while increasing intensity elicits a looming sensation and decreasing intensity a receding sensation. Alternatively, manipulating spectral cues can also elicit looming bias. Here, the direction-dependent filtering caused by the reflections of the listeners’ individually shaped pinnae, head, and shoulders provide the necessary spatial information: flattening the magnitude spectrum makes the sound appear looming (even into the listener’s head), while sharpening the magnitude spectrum leads to a receding sensation. To directly and independently compare both types of sound manipulation, we conducted an experiment playing smoothly cross-faded pairs of Schroeder-phase harmonic complex tones to elicit a moving sensation. As a control condition, we presented static sound-pairs without movement. The listeners judged the direction of the movement for every sound-pair. We expected to find a looming bias in the accuracy rates (higher accuracies for looms than recedes) as well as response times (shorter for looms) for both intensity and spectral-magnitude changes. The results will be discussed with regards to the different sound manipulations and their potential for studying the neural substrate of looming bias.