[The optimal stimulation parameters of the free-field auditory steady-state responses].

In normal hearing subjects the difference between ASSR and BT varied from 0 dB to 35 dB, and the significant correlation between them was observed (p<0.05). The maximum difference between ASSR and BT in children with SNHL was at 500 Hz (15.6±4.3 dB), minimum - at 2 and 4 kHz (8±2.9 dB and 7±3 dB respectively). In aided condition maximum difference was detected at 500 Hz (10.2±3.8 dB), minimum - at 1 and 2 kHz (7.8±2.8 and 7.3±3.1 dB respectively). We got significantly less difference between ASSR and BT in all test conditions using following types of stimuli: at 500 Hz and 1000 Hz - AM2 (p<0.01); at 2 and 4 kHz - Chirp (p<0.05 and p<0.01 respectively). Thereby, free field ASSR might be used as an objective method of evaluation the amplification outcomes in children with SNHL.