Mismatch negativity in children with specific language impairment and auditory processing disorder

Area of Science:

• Neuroscience
• Speech-Language Pathology
• Auditory Neuroscience

Background:

• Mismatch negativity (MMN) is an electrophysiological measure assessing auditory discrimination abilities.
• It reflects the brain's automatic response to auditory changes, independent of attention.
• MMN is valuable for studying the neurophysiological underpinnings of auditory processing.

Purpose of the Study:

• To examine the encoding of complex acoustic speech signals in children with specific language impairment (SLI).
• To compare auditory processing in children with SLI, auditory processing disorders (APD), and typical development (TD) using the MMN paradigm.

Main Methods:

• A prospective study involving 75 children (6-12 years): 25 with SLI, 25 with APD, and 25 with TD.
• MMN was elicited using frequent (/ga/) and rare (/da/) speech stimuli.
• Analysis focused on MMN latency and amplitude measures.

Main Results:

• Absence of MMN observed in 16% of children with SLI and 24% with APD.
• Children with SLI and APD exhibited significantly longer MMN latency and reduced amplitude compared to TD children.

Conclusions:

• Data reveal impaired automatic discrimination of speech sound components in children with SLI and APD.
• Findings suggest pre-attentional and pre-conscious auditory processing deficits affecting acoustic contrast discrimination.
• These deficits may contribute to difficulties in speech perception and language development.