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Sunday, November 29, 2009

HEARING WITH THE SKIN


Some years ago a chilean boy argued to see using alone the skin of their forearms. After blindfolding his eyes and before a cloud of peruvian journalists, the boy identified accurately different objects and figures placed at distance. Although Bryan Gick and Donald Derrick (U.British Columbia), didn't execute the same test, they demonstrated that the skin of any person is able to listen or help to listen, capturing the aspired air flow, associated to certain sounds. Before this all knew that when people watch a video in which somebody says "ga" and in the audio one listened "ba, all thinks they have listened "da". In fact, when we say "p", "t" and "s", a blow of air distinguishes them of letters with similar sounds: "b", "d" and "f". This way, to listen is a combined and innate effort of eyes, skin and ears.


The researchers demonstrated these differences, making 66 people listen: "pa" and "ba" and "ta" and "da", jointly with light blows emitted by thin tubes placed over the skin of hands and neck, jointly with sounds "pa" and "ta" and in other cases coinciding inappropriatelly with "ba" and "da". Without help of blows the participants confused "pa" with "ba" and "ta" with "da". That’s to say the perception of certain sounds rests in the ability of feeling those sounds, due to the existence of mechanoreceptors in the skin similar to the existent in ears able to respond to pressures of airflows. The authors added that imagenologic functional studies established the existence of an auditory-visual integration. Added tactile information is a crucial step to understand multisensorial integration.

ESCUCHANDO CON LA PIEL


Hace algunos años un niño chileno paso por Lima, arguyendo ver empleando solo la piel de sus antebrazos. Tras vendarle los ojos y ante una nube de periodistas limeños, el niño identifico con solvencia distintos objetos y figuras colocadas a distancia. Aunque Bryan Gick y Donald Derrick no ejecutaron la misma prueba, demostraron que la piel de cualquier persona es capaz de escuchar o ayudar a escuchar, captando el flujo aereo aspirado, asociado a ciertos sonidos. Antes de esto se sabia que cuando las personas ven un video en el que alguien dice "ga" y en el audio se escucha "ba," piensan que escucharon "da." En realidad, cuando decimos “p”, “t” y “s”, un soplido de aire las distingue de letras con sonidos similares : "b," "d" and "f". Asi, escuchar seria un esfuerzo conjunto e innato de ojos, oídos y piel


Los investigadores demostraron estas diferencias, haciendo escuchar a 66 personas : “pre” y “bre” y "tre" y "dre", conjuntamente con leves soplidos emitidos por tubos delgados adosados a piel de manos y cuello, liberados conjuntamente con los sonidos "pre" and "tre" y en otros casos coincidiendo inapropiadamente con "bre” y "dre". Sin ayuda de soplidos los participantes confundieron "pre" con "bre" and "tre" con "dre". Es decir que la percepcion de ciertos sonidos descansa en la habilidad de sentir esos sonidos, debido a la existencia de mecanoreceptores en la piel similares a los existentes en los oídos capaces de responder a presiones del flujo aéreo. Finalmente los autores añaden que los estudios imagenologicos funcionales establecieron la existencia de una integración auditivo-visual. El añadido de la información táctil, es un paso crucial para comprender integraciones multisensoriales.

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