Sensitivity, specificity and efficiency of speech-evoked ABR

Area of Science:

• Neuroscience
• Audiology
• Developmental Psychology

Background:

• Auditory Processing Disorder (APD) and Specific Language Impairment (SLI) are distinct neurodevelopmental conditions affecting auditory perception and language skills.
• Accurate diagnosis is crucial for timely intervention and improved outcomes in affected children.
• Speech-evoked Auditory Brainstem Response (ABR) offers a potential objective measure for assessing auditory pathway function.

Purpose of the Study:

• To determine the sensitivity, specificity, and efficiency of speech-evoked ABR as a diagnostic support tool for APD and SLI.
• To establish optimal cut-off values for various ABR waveforms in differentiating between children with APD, SLI, and typical development.
• To evaluate the clinical utility of speech-evoked ABR in Brazilian Portuguese-speaking children.

Main Methods:

• Speech-evoked ABRs were recorded using the five-formant syllable /da/ in 75 Brazilian Portuguese-speaking children (25 with APD, 25 with SLI, 25 typically developing).
• Waveforms V, A, C, D, E, F, and O were analyzed for latency values.
• Sensitivity, specificity, and receiver operating characteristic (ROC) analyses were performed to identify optimal cut-off points.

Main Results:

• Optimal latency cut-off values were established for waveforms V, A, C, D, E, F, and O.
• The 'A' wave showed the best diagnostic balance for the APD group, while 'A', 'D', and 'O' waves were most balanced for the SLI group.
• Higher sensitivity values were observed for the SLI group compared to the APD group when analyzed separately.

Conclusions:

• Speech-evoked ABR is a valuable tool for identifying children with auditory processing disorders and language impairments.
• The study provides crucial data for establishing the clinical application of speech-evoked ABR in pediatric audiology and speech-language pathology.
• This research contributes to the development of objective diagnostic measures for neurodevelopmental auditory and language disorders in a specific linguistic population.