Analysis of neural coding of speech in monaural and binaural conditions in children with speech sound disorder.

Cross-sectional design: a single time-point comparison cannot show that the latency difference is caused by the phonological disorder, that it changes with therapy, or that it predicts outcomes. It shows an association, not a trajectory. Small sample: 21 children per group at a single site. The amplitude result (p = 0.055) sits just above the conventional threshold, and with a larger sample the picture could shift. Control group was selected by convenience sampling rather than drawn from the same clinical population, which may introduce subtle differences in background, language exposure, or socioeconomic factors. Socioeconomic and environmental variables (maternal education, family income, school type) were not controlled or matched between groups, and the authors acknowledge this as a limitation that could confound the results. No correlational analysis was performed between the severity of the phonological disorder (PCC-R scores) and the FFR parameters; the authors state this is the subject of a separate study. The FFR stimulus was a single syllable (/da/), so the findings speak to encoding of one specific speech sound and may not generalise to all phonemes or to connected speech. Children were awake and watching a silent film during recording; the effect of this on FFR quality compared to sleep recordings is not discussed.

Funded by FAPEAL, a state research foundation in Alagoas, Brazil (grant E:60030.0000001502/2023). No industry funding, no conflicts of interest declared, and no commercial entity was involved in study design, data collection, or manuscript preparation.

Do not read this as evidence that FFR is now a validated diagnostic test for speech sound disorder or a tool for monitoring therapy progress. The study is a single cross-sectional comparison of 42 children at one site; it shows that wave V latency is longer in children who already have a clinical diagnosis of phonological disorder, but it does not show that FFR can make that diagnosis, that it changes with treatment, or that it predicts which children will respond to intervention. The authors themselves state that FFR should be understood as a complementary examination and that longitudinal studies are needed to evaluate whether FFR tracks therapeutic progress.