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  2. If a tree falls in a forest and no one is around to hear it ...

    en.wikipedia.org/wiki/If_a_tree_falls_in_a_forest...

    The tree will make a sound, even if nobody heard it, simply because it could have been heard. The answer to this question depends on the definition of sound. We can define sound as our perception of air vibrations. Therefore, sound does not exist if we do not hear it. When a tree falls, the motion disturbs the air and sends off air waves.

  3. Auditory illusion - Wikipedia

    en.wikipedia.org/wiki/Auditory_illusion

    Auditory illusion. Auditory illusions are illusions of real sound or outside stimulus. [1] These false perceptions are the equivalent of an optical illusion: the listener hears either sounds which are not present in the stimulus, or sounds that should not be possible given the circumstance on how they were created. [2]

  4. Synesthesia - Wikipedia

    en.wikipedia.org/wiki/Synesthesia

    A person with synesthesia may associate certain letters and numbers with certain colors. Most synesthetes see characters just as others do (in whichever color actually displayed) but they may simultaneously perceive colors as associated with or evoked by each one. Synesthesia ( American English) or synaesthesia ( British English) is a ...

  5. Auditory hallucination - Wikipedia

    en.wikipedia.org/wiki/Auditory_hallucination

    An auditory hallucination, or paracusia, [1] is a form of hallucination that involves perceiving sounds without auditory stimulus. While experiencing an auditory hallucination, the affected person hears a sound or sounds that did not come from the natural environment. A common form of auditory hallucination involves hearing one or more voices ...

  6. Finger snapping - Wikipedia

    en.wikipedia.org/wiki/Finger_snapping

    A video of finger snapping Alternative snapping technique. Snapping (or clicking) one's fingers is the act of creating a snapping or clicking sound with one's fingers. . Primarily, this is done by building tension between the thumb and another (middle, index, or ring) finger and then moving the other finger forcefully downward, so it hits the palm of the same hand at a h

  7. Psychoacoustics - Wikipedia

    en.wikipedia.org/wiki/Psychoacoustics

    Psychoacoustics. Psychoacoustics is the branch of psychophysics involving the scientific study of the perception of sound by the human auditory system. It is the branch of science studying the psychological responses associated with sound including noise, speech, and music. Psychoacoustics is an interdisciplinary field including psychology ...

  8. McGurk effect - Wikipedia

    en.wikipedia.org/wiki/McGurk_effect

    McGurk effect. The McGurk effect is a perceptual phenomenon that demonstrates an interaction between hearing and vision in speech perception. The illusion occurs when the auditory component of one sound is paired with the visual component of another sound, leading to the perception of a third sound. [ 1] The visual information a person gets ...

  9. What Is Ear Candling and Is It Safe? - AOL

    www.aol.com/lifestyle/ear-candling-safe...

    In conclusion, the evidence is clear: ear candling is neither practical nor safe and has been shown to cause injury in some cases. If you're looking for ways to clean your ears or remove earwax ...