Registration of Auditory Steady State Responses – ASSR test – is the main objective test, providing information about hearing thresholds at the basic speech frequencies (500–4000 Hz). One of the limitations for this test is the level of electroencephalographic (EEG) activity, corresponding to child’s the physiological sleep condition. However, compliance with this condition in diagnostics of hearing is not always possible in children with severe neurological and neuropsychiatric disorders.

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