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A state of high anxiety with people prone with Autism or very sensitive to sound, which is caused by abnormally high frequency brain waves. During high beta alertness, the person may become perceptive enough to hear their own brain waves, and only the sound of either a low frequency, or a calming voice may take them out of this state of anxiety. It can sometimes not be caused by an anxious episode, but it can make a person feel anxious, since in a quiet environment the high pitch humming akin to Tinnitus can be heard at times.
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