The developmental trajectory of functional excitation-inhibition balance relates to language abilities in autistic and allistic children.

Researchers studied brain activity patterns in 192 children (half autistic, half not) aged 6-17 years. They found that autistic children's brains develop differently in terms of how excited or calm brain activity becomes over time. Children with more excited brain activity in late childhood had more trouble understanding what they heard. The study suggests that the timing of when the brain develops better control over excitement might be important for autism traits, rather than just having an overall brain imbalance.

This study examined functional excitation-inhibition balance (f-EIB) in the brain using electrophysiological recordings from 92 autistic and 100 non-autistic children aged 6-17 years. Researchers investigated how brain activity patterns develop over time and their relationship to autism traits and language abilities. Results showed different developmental trajectories of brain excitation-inhibition balance between autistic and non-autistic children. Importantly, elevated brain excitability during late childhood and early adolescence was associated with poorer listening comprehension.

The findings challenge the idea of a general brain imbalance in autism when accounting for non-verbal IQ, instead suggesting that developmental timing of inhibitory brain activity may be crucial for understanding autism traits.

Findings suggest that monitoring brain development patterns during late childhood/early adolescence may be important for identifying language comprehension difficulties. Results support interventions targeting inhibitory brain function development rather than assuming static brain imbalances in autism.

Single study design with cross-sectional analysis of developmental trajectories. Sample size and demographic details not fully specified. Functional measure of excitation-inhibition balance is indirect. Causal relationships cannot be established from this observational study.

Autism is a neurodevelopmental condition that has been related to an overall imbalance between the brain's excitatory (E) and inhibitory (I) systems. Such an EI imbalance can lead to structural and functional cortical deviances and thus alter information processing in the brain, ultimately giving rise to autism traits. However, the developmental trajectory of EI imbalances across childhood and adolescence has not been investigated yet. Therefore, its relationship to autism traits is not well understood.

In the present study, we determined a functional measure of the EI balance (f-EIB) from resting-state electrophysiological recordings for a final sample of 92 autistic children from 6 to 17 years of age and 100 allistic (i.e., non-autistic) children matched by age, sex, and nonverbal-IQ. We related the developmental trajectory of f-EIB to behavioral assessments of autism traits as well as language ability. Our results revealed differential EI trajectories for autistic compared to allistic children. Importantly, the developmental trajectory of f-EIB values related to individual language ability.

In particular, elevated excitability in late childhood and early adolescence was linked to decreased listening comprehension. Our findings provide evidence against a general EI imbalance in autistic children when correcting for non-verbal IQ. Instead, we show that the developmental trajectory of EI balance shares variance with autism trait development at a specific age range. This is consistent with the proposal that the late development of inhibitory brain activity is a key substrate of autism traits.