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In the present study, hearing sensitivity in children with speech sound disorder (SSD) is scrutinized. Middle ear function (wideband tympanometry and acoustic stapedial reflexes, ASR) and inner ear function (audiometric thresholds in the conventional 1-8 kHz and extended 10-16 kHz high frequency (EHF) range, and distortion product otoacoustic emissions (DPOAEs 2-10 kHz ) were investigated. Hearing results were analyzed in relation to speech discrimination of phonemic contrasts (quiet and in noise conditions) and reproduction. Thirty-two children with SSD and 41 children with typical development (TD) ages 4-5 years participated. Children with SSD exhibited significantly less sensitive hearing compared to children with TD. This was demonstrated as more absent contralateral ASR (right ear SSD 43.7%; TD 22.0%), a higher prevalence of minimal hearing loss (MHL, > 15 dB HL at one or more frequencies or ears 1-8 kHz and PTA ≤ 20 dB HL, SSD 53.1%; TD 24.3%) and EHF hearing impairment (EHF HI, > 20 dB HL at one or more frequencies or ears 10-16 kHz , SSD 31.3%; TD 24.3%). At 2 kHz bilaterally, children with SSD showed significantly higher hearing thresholds than children with TD (mean difference, left ear 3.4 dB: right ear 4.3 dB), together with a significantly lower SNR in DPOAEs at 2.2 kHz (left ear 5.1 dB mean difference between groups). In all children, audiometric thresholds at the key-frequencies for speech, 2 and 4 kHz and DPOAEs within similar spectral regions, predicted 7-12% of the variance in phonemic discrimination and reproduction. Overall, these results suggest that hearing should be more fully investigated in children with SSD.

This study explored nonword repetition (NWR) and nonword decoding in normal-hearing (NH) children and in children with bilateral cochlear implants (CI). Participants were 11 children, with CI, 5:0-7:11 years (M = 6.5 years), and 11 NH children, individually age-matched to the children with CI. This study fills an important gap in research, since it thoroughly describes detailed aspects of NWR and nonword decoding and their possible associations. All children were assessed after having practiced with a computer-assisted reading intervention with a phonics approach during four weeks. Results showed that NH children outperformed children with CI on the majority of aspects of NWR. The analysis of syllable number in NWR revealed that children with CI made more syllable omissions than did the NH children, and predominantly in prestressed positions. In addition, the consonant cluster analysis in NWR showed significantly more consonant omissions and substitutions in children with CI suggesting that reaching fine-grained levels of phonological processing was particularly difficult for these children. No significant difference was found for nonword-decoding accuracy between the groups, as measured by whole words correct and phonemes correct, but differences were observed regarding error patterns. In children with CI phoneme, deletions occurred significantly more often than in children with NH. The correlation analysis revealed that the ability to repeat consonant clusters in NWR had the strongest associations to nonword decoding in both groups. The absence of as frequent significant associations between NWR and nonword decoding in children with CI compared to children with NH suggest that these children partly use other decoding strategies to compensate for less precise phonological knowledge, for example, lexicalizations in nonword decoding, specifically, making a real word of a nonword.