Cortical Visual Evoked Potentials in Subjects with Auditory Deprivation (Congenital Deafness)

In 30 healthy men (age 19–25 years) with normal hearing and 30 men of the same age suffering from complete congenital deafness, we examined peculiarities of the cortical visual evoked potentials, VEPs (photostimulation of the right and left eye by LED flashes, recording from loci O1 and O2). It was found that subjects with auditory deprivation demonstrated significantly shorter (P < 0.05–0.001) peak latencies of the early VEP components (P1, N2, and P2), while peak latencies of the late waves (N2 and P3) were greater (P < 0.05) than the corresponding indices in the control group. Peak-to-peak amplitudes of all VEP components in deaf subjects were about two to three times lower than those in subjects with normal hearing (P < 0.05–0.001). The mean total duration of the VEPs in deaf persons was significantly greater than in the control group (P < 0.05). Therefore, loss of the auditory function in deaf subjects results, due to cross-modal transformations, in substantial modifications of the potentials reflecting perception of the visual signals.

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