Cognitive Connie
What are early neurodevelopmental disorders?
ESSENCE — Early Symptomatic Syndromes Eliciting Neurodevelopmental Clinical Examinations — is an umbrella concept introduced by Christopher Gillberg to describe a cluster of conditions that share a common feature: symptoms emerging before the age of five that reflect differences in how the developing brain is organised, connected, and regulated.
Key figures
Leo Kanner
1894–1981Austrian-American psychiatrist who published the first formal clinical description of infantile autism in 1943, identifying a cluster of children with profound social withdrawal, insistence on sameness, and islands of ability. His 11 original cases defined what would become autism spectrum disorder.
Hans Asperger
1906–1980Austrian paediatrician who in 1944 independently described children with social difficulties but intact language and intelligence. His work remained largely unknown until translated by Uta Frith in 1991, after which 'Asperger syndrome' became widely used before being subsumed into ASD in DSM-5.
Virginia Douglas
1926–2019Canadian psychologist who in the 1970s argued that the core deficit in what was then called 'hyperkinetic reaction of childhood' was not excess activity but deficits in sustained attention and impulse control — instrumental in renaming the condition ADHD.
Christopher Gillberg
1950–presentSwedish child psychiatrist who introduced the ESSENCE concept to shift clinical thinking away from categorical, single-diagnosis models toward a more integrated understanding of early neurodevelopmental presentations. His research on autism, ADHD, DCD, and their overlaps spans more than four decades.
Key concepts
Autism Spectrum Disorder (ASD)
A neurodevelopmental condition characterised by persistent differences in social communication and interaction, alongside restricted and repetitive behaviours, interests, or activities. The term 'spectrum' reflects enormous heterogeneity in presentation, ability, and support needs. Prevalence is approximately 1–2% of the population.
ADHD (Attention-Deficit/Hyperactivity Disorder)
Characterised by developmentally inappropriate levels of inattention, hyperactivity, and impulsivity. Three presentations are recognised in DSM-5: predominantly inattentive, predominantly hyperactive-impulsive, and combined. ADHD involves differences in executive function and dopaminergic regulation in frontostriatal circuits.
Developmental Coordination Disorder (DCD)
A motor learning disability characterised by difficulties acquiring and executing coordinated motor skills, causing significant impairment in daily activities. Often called 'dyspraxia' in the UK. Affects approximately 5–6% of school-aged children and frequently co-occurs with ADHD, DLD, and ASD.
Developmental Language Disorder (DLD)
Significant and persistent difficulties with language acquisition in the absence of hearing loss, intellectual disability, or neurological disorder. Affects around 7% of children and has a substantial genetic component. Often under-identified because early delays may be attributed to 'late talking.'
Comorbidity in ESSENCE
The co-occurrence of two or more ESSENCE conditions in the same individual. Research consistently finds that 50–80% of children with ASD also have ADHD; around 50% of those with ADHD have DCD. Understanding comorbidity is essential for comprehensive intervention planning.
Executive function deficits
A common transdiagnostic feature across ESSENCE conditions. Executive functions — working memory, inhibitory control, and cognitive flexibility — are mediated by prefrontal cortical systems. Difficulties with these functions manifest as challenges in planning, self-regulation, and adapting to change.
Neurodiversity
A perspective that frames neurological differences (as seen in autism, ADHD, dyslexia, and related conditions) as natural variation in the human brain rather than deficits or disorders. While not a clinical term, the concept shapes contemporary approaches to intervention, education, and identity.
Early intervention
The provision of therapeutic, educational, or family support services during the early childhood years (typically 0–6), when brain plasticity is greatest. Evidence supports early intervention for improving outcomes across ASD, DLD, DCD, and ADHD — and the ESSENCE framework explicitly endorses acting on early signs without waiting for a definitive diagnosis.
Test your knowledge
Sources
Last reviewed July 2025- 1.
American Psychiatric Association. (2013). Diagnostic and Statistical Manual of Mental Disorders (5th ed.). APA Publishing.
+About this source
Primary diagnostic reference for neurodevelopmental disorders including ASD, ADHD, DLD, and DCD.
- 2.
Gillberg C. (2010). The ESSENCE in child psychiatry: Early Symptomatic Syndromes Eliciting Neurodevelopmental Clinical Examinations. Research in Developmental Disabilities, 31(6), 1543–1551.
+About this source
Original paper introducing the ESSENCE framework for understanding co-occurring early neurodevelopmental presentations.