Credits to Wouter Gordts
Both individuals with normal or impaired hearing (problems of the outer and/or middle ear) can perceive sound
Internal sounds are re-internalized in an audible way without the air medium. Inner soundscapes have been recorded through contact microphones, which function as sound transducers. The transmission of the sound is realized through direct contact of the "stethophone" to the head - bone conduction - thus creating a full closed circuit, starting from the contact recording of the inner sounds to the contact transmission of them.

During this chain process, the sound is being kept internal and is being reproduced again internally, directly to the inner ear, deviating the air transmission of sound waves which is the hearing through the external ears.

Phonophorous Part-1
Croxhapox gallery, Ghent, Belgium (November 2010)
Internalizing audible the electromagnetic (EM) oscillations into the perceiver's head, with a conductive use of sound, bypassing the air medium. The participant is detecting EM oscillations while moving through electronic and electrical devices. The "stethophone" transmits sound straight into the inner ear when conducted to the head (to various positions where the sound can be clearly conducted). Pair of earmuffs, a "stethophone" and an EM detector are available for the participant. Once she/he has plugged the ears, they can detect EM oscillations by moving through space and perceive the sound by conducting the "stethophone" on her/his head. The whole procedure is completely silent - no sound is perceived through airwaves.
Phonophorous Part-2
KASK, Ghent, Belgium (May 2011)