The Kinetic Information Channel: A Sixth Register for Information Processing Theory

Information Processing Theory, as formalized by Atkinson and Shiffrin in 1968, assumes that information enters the cognitive system through specialized sensory registers. The auditory register, echoic memory, has been defined exclusively as processing air-conducted sound through the outer and middle ear. This assumption has excluded alternative transduction pathways, including bone conduction, which transmits mechanical vibrations through the skeleton directly to the inner ear. As a result, individuals who rely on bone-conduction devices and cochlear implants—and the many non-human animals that rely on natural bone-conduction pathways—have been absent from the theory. This paper proposes the addition of a sixth register to Information Processing Theory: the kinetic information channel. This channel processes mechanical vibrations transmitted through the skeletal system via bone conduction to the inner ear. It is distinct from the existing auditory register because it bypasses the outer and middle ear and does not rely on air conduction. It is distinct from the tactile register because it is processed by the auditory system, not the somatosensory system. The kinetic channel is phylogenetically ancient and conserved across vertebrates. It operates in elephants detecting seismic vibrations, in Tyrannosaurus rex through the mandible-on-ground posture, in humans using bone-conduction devices, and in a wide range of other taxa including snakes, chameleons, and extinct species such as Kawingasaurus fossilis. In each case, the biophysical pathway and the cognitive architecture are the same. The proposed extension addresses a gap in Information Processing Theory, recognizing that audition is not limited to air conduction. By including the kinetic information channel, the theory becomes more complete and more inclusive of the diverse pathways through which information enters the cognitive system.