Unconstrained multivariate EEG decoding can help detect lexical-semantic processing in individual children.

Area of Science:

• Neuroscience
• Developmental Psychology
• Psycholinguistics

Background:

• Standard language comprehension assessments are unreliable for minimally-verbal individuals with autism spectrum disorder.
• The N400 brain response is a known marker for lexical-semantic violations at the group level.
• Homogeneity of N400 responses in neurotypical children is not well-established.

Purpose of the Study:

• To investigate the homogeneity of N400 responses to lexical-semantic anomalies in neurotypical children.
• To explore advanced analytical methods for capturing neural responses in heterogeneous populations.
• To inform the development of sensitive language comprehension tests for autism spectrum disorder.

Main Methods:

• Electroencephalography (EEG) was used to measure neural responses in 20 neurotypical children.
• Participants were presented with congruent and incongruent visual animations and spoken sentences.
• Temporally and spatially unconstrained multivariate pattern analyses (MVPA) were employed alongside descriptive analyses.

Main Results:

• Despite robust group-level responses, high inter-individual variability was observed in response to lexico-semantic anomalies.
• Neurotypical children exhibit heterogeneous neural responses in terms of timecourse, topography, and effect strength.
• MVPA revealed patterns of response that varied significantly across individuals.

Conclusions:

• Individual-level variability in neural responses to semantic anomalies is significant even in neurotypical children.
• Current group-level analyses of the N400 may not be sufficient for assessing language comprehension in heterogeneous populations.
• Future applications for autism spectrum disorder require individual-subject analyses robust to variations in neural response patterns.