[Relation between comfortable loudness and maximal speech intelligibility in children with sensorineural hearing loss]. / Sootnoshenie urovnia komfortnoi gromkosti i urovnei maksimal'noi razborchivosti rechi pri neirosensornoi tugoukhosti u detei.

The levels of comfortable loudness and those of maximal intelligibility were evaluated in 88 schoolchildren with dull hearing (20-90 dB reduction). All the examinees had the levels of comfortable loudness in the range of the maximal intelligibility, this permitting it to be a criterion in determination of optimal amplification in hearing aids. A significant correlation exists between comfortable loudness and hearing threshold at 500 Hz frequency, mean hearing threshold in the range of the principal speech frequencies 500-2000 Hz and in the range of the safest speech frequencies 250-1000 Hz. However, the range of the individual values of comfortable speech intensity in the same hearing thresholds proved to be 15-25 dB for one-syllable words and 20-40 dB for the standard speech tables making it impossible to recommend the threshold parameters for calculation of optimal intensity of the speech to receive. The most reliable way to do this is the adjustment of the speech loudness level by subjective sensation of the child.

[The effect of the frequency characteristics of hearing aids on speech perception in children with neurosensory hearing loss]. / O vliianii chastotnykh kharakteristik slukhovykh apparatov na vospriiatie rechi pri neirosensornoi tugoukhosti u detei.

The efficacy of sound reinforcement at two bandwidths (high frequency at 250-5000 Hz and low frequency at higher than 1000 Hz frequencies with a steepness of 14 dB in the octave) in the hearing aids of children with hypoacusis was investigated. Altogether 67 children at the age of 11 to 14 years with an average hearing impairment of 35 to 97 dB were examined. In the low frequency range, 3% of the children showed a better, 33% a lower and 64% an unchanged discriminatory capacity of speech when compared to the high frequency range. The lack of the filtration effect on the discriminatory capacity was seen in children with a moderate hearing loss at high frequencies (in 50% children) due to adequate hearing perception at the above bandwidths or in children in whom hearing thresholds at 2000 and 4000 Hz were so high that failed to provide proper speech perception at both bandwidths. Therefore when hearing aids are regularly used, the high frequency range of the spectrum is sufficiently informative for the overwhelming majority of children with hearing loss, i. e. for 83%. These results give evidence that a high frequency range is adequate for children with hearing loss if they begin to use hearing aids from an early stage.