The second time, it rings in the wake of some ambient restaurant noise. ![]() The first time, the tone rings by itself. The second illusion is called “silence event-based warping.” The listener hears a tone in two different contexts. candidate at Johns Hopkins, told Scientific American. “This suggests that our mind constructs similar auditory representations that might underpin our experience of silence,” first author Rui Zhe Goh, a Ph.D. Although the two periods are exactly the same length, participants tend to say the second uninterrupted period is the longer one. This illusion challenges the listener to guess which of the two silent periods is longer. The second period, however, is one uninterrupted stretch of silence. In the first period, a brief burst of sound punctuates the silence halfway through. Then, they’re presented with two different silent periods. The listener acclimates to recorded ambient noise like that in a restaurant or busy street corner. This inversion of the trick tests someone’s perception of how long a silence lasts. The first illusion - called “one is more” - was originally used to test the perception of sound duration, or how long a person thinks something lasts, versus how long it actually lasts. They published their findings in the journal Proceedings of the National Academy of Sciences on July 10.įor the study, one-thousand participants took part in seven versions of three different auditory illusions adapted from prior perception tricks to probe what it means to sense and perceive. Using aural illusions, the researchers demonstrated that the brain does, in fact, actively process quietness as it processes sound. Psychologists and philosophers at Johns Hopkins University dug into the question of how the brain processes sound. What is silence, exactly? In quiet moments, does the brain register silence the same way it hears, say, music? Or does it demarcate silence as the gaps between noises?
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