Construct validity of the First-Year Inventory (FYI Version 2.0) in 12-month-olds at high-risk for Autism Spectrum Disorder

Caregiver report of infant behavior associated with autism likelihood in first year of life

BACKGROUND

Identification of prodromal indicators of autism in infancy has the potential to identify behaviors relevant to early autism screening.

METHODS

We report on data from a prospective general population birth cohort with maternal reported measures at 9 and 12 months: the Survey of Well-Being of Young Children (SWYC; general developmental surveillance) and the First Year Inventory-Lite v3.1b (FYI-Lite; autism specific parent report research tool). Mothers completed the surveys and the Broad Autism Phenotype Questionnaire (BAPQ), a self-report measure of subclinical features of autism.

RESULTS

In this sample of 332 infants (168 males), maternal-reported infant developmental milestones and behavioral indicators of difficult temperament, poor adaptability, and sleep problems at 9 months (SWYC) and maternal self-reported subclinical autism characteristics (BAPQ) were correlated with maternal-reported autism-related behaviors on the FYI-Lite at 12 months. Regression models revealed significant unique associations between infant temperament, developmental milestones, and FYI-Lite scores while controlling for significant effects of maternal BAPQ scores and education.

CONCLUSIONS

Maternal report of infant temperament and developmental milestones at 9 months were associated with maternal-report early indicators of autism likelihood at 12 months in a general birth cohort. Follow up of this cohort is needed to determine associations with formal diagnostic outcomes.

IMPACT

Identifying scalable measures of infant behaviors in general and specific to autism may help identify targets of intervention for infants in the first year of life. This study aims to contribute to improved first-year surveillance by assessing potential early autism indicators in a prospective general birth cohort, whereas other observational studies utilize enriched risk cohorts (e.g., infant siblings of autistic children). Preliminary findings of this cohort revealed that a maternal report of 9-month temperament significantly predicted higher scores on a maternal report 12-month autism screener and indicated the importance of considering maternal self-reported subclinical autism characteristics when interpreting parent report screeners.

Hypoconnectivity between anterior insula and amygdala associates with future vulnerabilities in social development in a neurodiverse sample of neonates

Altered resting state functional connectivity (FC) involving the anterior insula (aINS), a key node in the salience network, has been reported consistently in autism. Here we examined, for the first time, FC between the aINS and the whole brain in a sample of full-term, postmenstrual age (PMA) matched neonates (mean 44.0 weeks, SD = 1.5) who due to family history have high likelihood (HL) for developing autism (n = 12) and in controls (n = 41) without family history of autism (low likelihood, LL). Behaviors associated with autism were evaluated between 12 and 18 months (M = 17.3 months, SD = 2.5) in a subsample (25/53) of participants using the First Year Inventory (FYI). Compared to LL controls, HL neonates showed hypoconnectivity between left aINS and left amygdala. Lower connectivity between the two nodes was associated with higher FYI risk scores in the social domain (r(25) = -0.561, p = .003) and this association remained robust when maternal mental health factors were considered. Considering that a subsample of LL participants (n = 14/41) underwent brain imaging during the fetal period at PMA 31 and 34 weeks, in an exploratory analysis, we evaluated prospectively development of the LaINS-Lamy connectivity and found that the two areas strongly coactivate throughout the third trimester of pregnancy. The study identifies left lateralized anterior insula-amygdala connectivity as a potential target of further investigation into neural circuitry that enhances likelihood of future onset of social behaviors associated with autism during neonatal and potentially prenatal periods.