Self-Injurious Behavior in Autism and Intellectual Disabilities
Summary
Self-injurious behaviour (SIB) comprises a range of repetitive, deliberate actions that result in physical harm to one’s own body, including head-banging, self-biting and skin-picking. It is highly prevalent in individuals with autism spectrum disorder and those with intellectual disabilities, affecting up to 40–50% of some cohorts. The severity and persistence of SIB are influenced by a combination of biological, sensory and behavioural factors. Neurobiological pathways implicate altered pain processing and atypical sensory reactivity, while behavioural dysregulation characterised by impulsivity, overactivity and communication deficits often precedes onset and predicts chronicity. Understanding the typology and developmental trajectory of SIB is essential for designing effective early-intervention strategies. A global perspective emphasises that culturally sensitive assessment tools and multidisciplinary care models—spanning behavioural therapy, pharmacological support and, in some cases, specialised neurosurgical or neuromodulatory approaches—are critical to improving quality of life for affected individuals and their caregivers.
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Self-Injurious Behavior in Autism and Intellectual Disabilities publication trend
The graph below shows the total number of articles in self-injurious behavior in autism and intellectual disabilities across all publications each year (not limited to Nature Index journals).
Technical terms
Self-injurious behaviour (SIB): Repetitive actions directed toward one’s own body that cause physical harm.
Intellectual disability: A neurodevelopmental condition marked by significant limitations in intellectual functioning and adaptive behaviour.
Topography: The specific form or physical pattern of a behaviour (e.g. head-banging, skin-picking).
Impulsivity: A tendency to act suddenly without adequate forethought, linked to heightened risk of SIB.
Overactivity: Excessive motor activity often associated with behavioural dysregulation and persistence of SIB.
Meta-analysis: A statistical method for combining results from multiple studies to produce a pooled estimate.
Botulinum neurotoxin injection: Therapeutic administration of botulinum toxin to reduce muscle-mediated self-injury movements.
References
- The Prevalence of Self-injurious Behaviour in Autism: A Meta-analytic Study. Journal of Autism and Developmental Disorders (2020).
- Self-Injury in Autism Spectrum Disorder and Intellectual Disability: Exploring the Role of Reactivity to Pain and Sensory Input. Brain Sciences (2017).
- Persistence of self-injurious behaviour in autism spectrum disorder over 3 years: a prospective cohort study of risk markers. Journal of Neurodevelopmental Disorders (2016).
- Persistence and predictors of self-injurious behaviour in autism: a ten-year prospective cohort study. Molecular Autism (2020).
- Botulinum Neurotoxin Injections in Children with Self-Injurious Behaviors. Toxins (2023).
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