[What average hearing gains can be expected at present with children wearing hearing aids?]

The narrow band noise-audiometric free-field hearing threshold of hearing aids encloses at least some of the essential part of the acoustic language field even in marked unisensory infant hearing impairment. Thus auditive promotion is to be preferred even in "deaf" children compared to optic-tactile aids. This has an advantage for language development and also has consequences for the method of training. Statistical evaluation of the pure tone and narrow band noise-audiometric data allows conclusions to be drawn about the quality of hearing aids adjustment and especially about the importance of the medium pure tone-audiometric hearing thresholds limit at 70-75 dB.