The article presents a review of foreign studies on the participation of the vestibular system in speech perception. Although for a long time it was believed that the vestibular system is involved only in the management of balance and motor skills, there is increasing evidence that it is involved in cognitive processes such as memory, attention, and speech. There is no doubt that auditory perception is necessary for speech perception. The peripheral parts of the vestibular and auditory analyzers are anatomically closely related. But there is not enough research on how vestibular organs affect auditory perception. Evolutionarily, the vestibular apparatus appeared in animals much earlier than the peripheral hearing organs. The human vestibular apparatus consists of five paired sections: three semicircular canals and two otolith organs – the utriculus and sacculus. In the process of evolution, the semicircular canals of humans and other mammals underwent maximum changes. The ability to register auditory information was preserved only in one of the parts of the vestibular apparatus – sacculus. Vestibular (saccular) hearing allows us to register low-frequency sounds in the range from 100 to 1000 Hz. This helps speech perception, as this frequency range is associated with the perception of intonation and other prosodic components of the utterance. Saccular hearing also helps speech perception in noise. Data on the role of the vestibular apparatus in speech perception are useful for all speech and language specialists. The ability of the sacculus to respond to sound is used for instrumental diagnostics of the vestibular system – cervical vestibular myogenic evoked potentials (cVEMP).
Read full abstract