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. 2021 Apr 14;12:608684. doi: 10.3389/fpsyg.2021.608684

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Copyright © 2021 Siedenburg, Goldmann and van de Par.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Illustration of amplitude modulation (AM) manipulation. An excerpt of 0.5 s in the middle portion of the sounds was processed with AM with a modulation depth of 65% and a modulation rate of 8 Hz (i.e., modulation period of 0.125 s). (B) Lab setup for experiment. An experimental participant was seated in front of four loudspeakers in an acoustics lab. For the heterogeneous instrumentation, voices were played by the flute, violin, French horn, and bassoon; for the homogeneous instrumentation, voices were played by the instruments of a string quartet. (C) Visualization of the experimental task. Listeners were presented a cue, followed by a mixture, and they were asked to decide whether there was an amplitude modulation (AM) in the cued voice.