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    Fingernails run across a chalkboard cause an unusual, and perhaps involuntary, shuddering or unease, sometimes felt right down the spine. Personally, I experience this feeling even thinking about it, and call it the "chalkboard feeling". What specifically causes this reaction, and is there a scientific or medical name for it?

    Question #71126. Asked by crumbworks. (Oct 02 06 2:58 AM)


    cathrine98

    		The sound caused by scraping fingernails across a chaulkboard is a particularly unpleasant sound for humans.

    As to your reaction just by the thought, it seems to be a mental reaction to the memory of the sound.

    http://www.straightdope.com/classics/a2_317b.html

    Oct 02 06, 12:22 PM
    crumbworks

    		Yes, but why does the sound trigger a weird tingling down the spine? Very few sounds themselves would cause such a reaction.

    Oct 02 06, 7:47 PM

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