The effects of intellectual functioning and autism severity on outcome of early behavioral intervention for children with autism.
Higher starting IQ and milder social symptoms still predict the fastest language gains under full-dose EIBI, but you can amplify progress for all kids by lengthening treatment and tightening program quality.
01Research in Context
What this study did
Esther and her team tracked 25 toddlers with autism through one year of Early Intensive Behavioral Intervention. Every child got 25–30 hours a week of one-to-one ABA in a center.
Before therapy started the kids took IQ, language, play, and social tests. The researchers wanted to see if baseline scores predicted who would gain the most over the study period.
What they found
All 25 children improved in language, play, social, motor, daily living, and cognitive scores. The gains were medium-sized across the board.
Kids who entered with higher IQ and milder social delays made the biggest language and play leaps. Severity of repetitive behaviors did not change the outcome.
How this fits with other research
Slater et al. (2020) ran an RCT that seems to clash: they found extra hours only help toddlers with mild autism symptoms. The studies differ because Paul compared 15 vs 25 hours, while Esther gave everyone 25–30. The message: once you hit 25+ hours, IQ and social level still matter.
Linstead et al. (2017) add that more total months of ABA boosts mastery even further. So high IQ plus long duration equals the fastest track.
Långh et al. (2021) shift the spotlight from child traits to program traits. They show that well-organized teams using clear teaching loops and differential reinforcement speed gains in only four to six months. Child IQ helps, but quality control can lift lower-IQ kids too.
Why it matters
Screen every new client with a non-verbal IQ task and a brief social checklist. If scores are low, keep the dose at 25+ hours but add extra staff training and AAC tools. Re-check quality markers monthly so program factors, not just child factors, push language forward.
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02At a glance
03Original abstract
UNLABELLED: This study assessed the relation between pre-intervention variables (cognition, socialization and communication) to outcome in young children with autism. METHOD: Twenty five children with autism (20-32 months) were enrolled in intensive behavior intervention. The children were divided into groups based on their IQ scores and on the severity of their social interaction and communication deficits [per autism diagnostic observation schedule (ADOS) scores]. Six developmental-behavioral domains including, imitation, receptive language, expressive language, nonverbal communication skills, play skills and stereotyped behaviors were assessed at pre- and post-1 year of intervention times. RESULTS: Significant progress was noted in all the six developmental-behavioral domains after 1 year of intervention. Children with higher initial cognitive levels and children with fewer measured early social interaction deficits showed better acquisition of skills in three developmental areas, receptive language, expressive language and play skills. Both groups showed better progress in Receptive language skills. Better progress in expressive language was associated with the child's social abilities, while more significant progress in play skills was related to pre-intervention cognitive level. CONCLUSIONS: These findings emphasize the importance of early intensive intervention in autism and the value of pre-intervention cognitive and social interaction levels for predicting outcome.
Research in developmental disabilities, 2007 · doi:10.1016/j.ridd.2006.03.002