Where is the evidence that ABA works?
Two landmark studies, Lovass (1987) and Fenske (1985) demonstrate that children with autism who get a program of Applied Behavior Analysis show significant improvements in learning, reasoning, communication and adaptability.
Two factors that can maximize the effectiveness of ABA are starting services when a child is younger or starting with a child that is farther along developmentally, but studies have demonstrated that preschoolers who participate in early intensive ABA for two or more years can acquire enough skills to be mainstreamed into age/grade level appropriate classrooms with little or no additional support. Even without these moderating factors, ABA has been shown to be effective with older children, adults and those whose developmental age may be limited.
A study published in the Journal of Child Psychology and Psychiatry in 2013 focused on 34 children diagnosed with ASD who had achieved an “optimal outcome” which was defined as a complete loss of ASD symptoms including any impairment in communication or social interaction. The researchers compared these recovered children with non-recovered autistic kids and found significant differences. The recovered children fell back into the “normal” range in all areas.
In another study published in the Journal of the American Academy of Child and Adolescent Psychiatry in 2012, EEGs showing brain activity of ASD-diagnosed children who received ABA were compared with ASD-diagnosed children who did not get ABA while they were performing tasks of viewing faces and objects. Researchers found that the children who received significant ABA behavioral interventions had normalized patterns of brain activity.