In article <Jk5U2Cx.greystroke at delphi.com>, greystroke at delphi.com writes:
>I hope this is the appropriate message base...
>>Anyways, on to the question...Being a high school student, I can't help but
>notice the severe irritation caused in some people by that nasty sound of a
>teacher's fingernails accidently screeching accross a chalkboard. Though
>I know some people are merely annoyed by the sound, others, such as myself
>absolutely cannot tolerate the noise. Hearing it makes me cringe; I want
>to flee from the sound and attack the person making the sound at the same
>moment. Others experience the same sensation. WHY does such a sound
>cause so much anger and irritation in many people. I cannot understand
>why it does so, considering the noise is not physically painful. I have
>checked with people from other countries (Ukraine, Russia, China, Spain, and
>Japan), and the effect is the same there. Since this is not something that
>we have shared with other cultures mediawise, I assume that it must be
>>Anyone have any answers?
>According to evolutionary theory the screech is similar to the distress
call of monkeys. We may still be neurological wired as a biological
predispositon that alerts us to this sound.