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Abstract
The audio-visual reflex has been registered by means of a DC-electronystagmograph in a series of 10 normal-hearing adults. The acoustic stimulus is an octave filtered white noise band around 1 000 cps with an intensity of 60 db emitted at random from 7 loud-speakers, placed in a half-circle with an interval of 20 degrees, the maximal deviation from azimuth being ± 60 degrees. The deflections of the eyes in the dark towards the sound are compared to the calibration curve, where light-signals replace the loud-speakers. The reliability of this last method has been determined to be ± 2.7, while the standard deviation of the lateralization of sound was found to have a mean value of ± 8.3° increasing in the most lateral positions. Experiments with 2 ear-level hearing aids gave results with no statistical difference from experiments with the unaided ears, while one pocket hearing aid connected to both ears through a Y-cord gave no lateralization at all.