Illusions are a delight to our playful minds, and artists, magicians, and scientists have long been searching for ways to create multiple meanings out of a single picture, sound, video or physical object. This multi-stable auditory illusion opens opportunities for studying the perceptual, cognitive, and neural representation of objects in motion, as well as exploring multimodal perceptual awareness. Participants were biased towards perceiving transverse compared to bouncing paths, and they became perceptually locked into alternating between front-to-back and back-to-front percepts, perhaps reflecting how auditory objects commonly move in the real world. In a second experiment, the illusory stimulus was looped continuously in headphones while participants identified its perceived path of motion to test properties of perceptual switching, locking, and biases. These results show that this illusion is effectively quadri-stable. Participants perceived all four illusory motion percepts, and could not distinguish the illusion from the unambiguous stimuli. When asked to rate their confidence in perceiving each sound’s motion, participants reported equal confidence for the illusory and unambiguous stimuli. ![]() Here we demonstrate how human listeners experience this illusory phenomenon by comparing ambiguous and unambiguous stimuli for each of the four possible motion percepts. The sound can be perceived as traveling transversely from front to back or back to front, or “bouncing” to remain exclusively in front of or behind the observer. Here, we introduce a novel quadri-stable illusion, the Transverse-and-Bounce Auditory Illusion, which combines front-back confusion with changes in volume levels of a nonspatial sound to create ambiguous percepts of an object approaching and withdrawing from the listener. However, the human auditory system has unequally distributed spatial resolution, including difficulty distinguishing sounds in front vs. One way we estimate the motion of an auditory object moving towards or away from us is from changes in volume intensity. A similar illusion also occurs with two frequencies arbitrarily chosen from within this octave range.In addition to vision, audition plays an important role in sound localization in our world. The remaining 38% reported a variety of percepts, but no listener perceived the stimulus correctly. Another 14% of the listeners obtained the same illusion but with the high pitch consistently localized in the left ear. Two listeners with absolute pitch identified the alternating pitches as G 4 (392 Hz) and G 5 (784 Hz). When the identical sequence was again presented but with earphones reversed, these listeners reported the identical percept with the higher pitch still localized in the right ear. Under these conditions 48% of 42 right‐handed listeners perceived a single tone oscillating from ear to ear whose pitch also oscillated from one octave to the other in synchrony with the localization shift and with the higher pitch localized in the right ear. However, when one ear received 800 Hz, the other received 400 Hz and vice versa. This sequence of alternating tones presented at equal amplitude to both ears simultaneously for 20 sec. ![]() All tones were either 400 or 800 Hz, and these frequencies were presented in strict alternation. Listeners were presented with a sequence of sinusoidal tones, each tone 250 msec in duration and with no gap between adjacent tones.
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