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09 Feb 15
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Human echolocation is the ability of humans to detect objects in their environment by sensing echoes from those objects. By actively creating sounds –
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27 Nov 12
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Human echolocation is an ability of humans to detect objects in their environment by sensing echoes from those objects. By actively creating sounds – for example, by tapping their canes, lightly stomping their foot or making clicking noises with their mouths – people trained to orientate with echolocation can interpret the sound waves reflected by nearby objects, accurately identifying their location and size. This ability is used by some blind people for acoustic wayfinding, or navigating within their environment using auditory rather than visual cues
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Vision and hearing are closely related in that they can process reflected waves of energy. Vision processes light waves as they travel from their source, bounce off surfaces throughout the environment and enter the eyes. Similarly, the auditory system processes sound waves as they travel from their source, bounce off surfaces and enter the ears
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Echoes can give detailed information about location (where objects are), dimension (how big they are and their general shape), and density (how solid they are). Location is generally broken down into distance from the observer and direction (left/right, front/back, high/low). Dimension refers to the object's height (tall or short) and breadth (wide or narrow).
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not only did they perceive the objects based on the echoes, but they also showed activity in those areas of their brain that normally process visual information in sighted people
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Importantly, when the same experiment was carried out with sighted people who did not echolocate, these individuals could not perceive the objects and there was no echo-related activity anywhere in the brain
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Daniel Kish, who works with the blind, leading blind teenagers hiking and mountain-biking through the wilderness and teaching them how to navigate new locations safely, with a technique that he calls "FlashSonar",[11] through the non-profit organization World Access for The Blind.[12] Kish had his eyes removed at the age of 13 months due to retinal cancer. He learned to make palatal clicks with his tongue when he was still a child -- and now trains other blind people in the use of echolocation and in what he calls "Perceptual Mobility"
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Kish reports that "The sense of imagery is very rich for an experienced user. One can get a sense of beauty or starkness or whatever - from sound as well as echo".[11] He is able to distinguish a metal fence from a wooden one by the information returned by the echoes on the arrangement of the fence structures; in extremely quiet conditions, he can also hear the warmer and duller quality of the echoes from wood compared to metal
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27 Nov 11
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10 Feb 11
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29 Jul 09
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27 Jan 09
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28 Mar 08
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24 Mar 08
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13 Mar 07
Sean FentonHuman echolocation is the ability of humans to sense objects in their environment by hearing echos off those objects. This ability is used by some blind people to navigate within their environment. ... An accomplished user of echolocation is Ben Underwoo
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