According to one aspect of the invention, the invention is a method of detecting an air pressure change within an ear of a person. The method includes steps of placing a microphone at least partially within an ear of the person; detecting the change in air pressure within the ear of the person using the microphone, the change in air pressure corresponding to an initiating action made by person; producing an electrical signal corresponding to the internally detected change in air pressure; and processing the electrical signal to produce a corresponding output. Various systems and sensors for use in detecting changes within the ear are also disclosed.
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