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What is it that we hear when we hear nothing at all?
In a study, researchers used sonic illusions to show that people perceive silences much as they hear sounds. The results suggest that people perceive silence as its own type of “sound,” not as a gap between noises.
Rui Zhe Goh and other researchers from Johns Hopkins University tested people recruited online with a series of sound illusions. One test compared a single longer sound with two shorter sounds. The two shorter sounds together added up to the same amount of time as the longer sound. But when people listened to them, they perceived the single sound as lasting longer.
To apply that illusion to silence, Mr. Goh and colleagues inverted the test. The scientists used sounds of restaurants, busy marketplaces, trains or playgrounds, and inserted chunks of silence for participants to compare.
In every case they tested, listeners perceived the illusion of a period of silence being longer just as they would have perceived an illusion of a longer sound.
No estudo relatado no texto, os resultados dos testes com ilusões sonoras levaram pesquisadores a supor que as pessoas
