What our body does, in effect, is to continually keep us in a quiet room. Every once in a while, we are momentarily exposed to a sound. Each time this happens, we experience the full effect. We are never given a chance to get accustomed to it—to develop resistance. High levels alone do not lead to resistance. There are two requirements for resistance—high hormonal levels and constant stimulus. We’ve known this for quite some time. In fact, we use this to our advantage in drug therapy for angina (chest pain). Patients prescribed a nitroglycerin patch are often given the instructions to put the
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