Purpose This paper aims to investigate the long-term impacts autistic adults experienced from childhood participation in the applied behavioural analysis (ABA). Design/methodology/approach Possible participants were recruited through advertisements on social media and autism and ABA organisations. Possible participants were given the choice between an online or face-to-face interview or an anonymised online questionnaire. Findings Reflections from 10 participants were indicative of a predominantly detrimental impact of ABA. Reflections gave rise to a core theme “recalling hidden harms of childhood experiences of ABA”. Outcomes are discussed in relation to the impact on autistic identity, current research and progressing understanding of the impacts of early intervention from the autistic perspective. Research limitations/implications The practical implications of ABA are discussed alongside recommendations for future practice and research with the involvement of autistic individuals within interventive processes. Originality/value This is the first paper to take an in-depth, qualitative approach to autistic experiences of ABA. The findings themselves are driven to conceptualise and give voice to the core impacts which carried through participants’ exploration and understanding of self.