Foundations

Definition

What Is Neurodivergence? A Scientific Definition

Neurodivergence describes naturally occurring variation in how human brains process information — a framework that reframes conditions such as autism, ADHD, and dyslexia as differences in cognitive architecture rather than deficits.

Taxonomy

Types of Neurodivergence: A Clinical Taxonomy

Neurodivergence is not one condition. It is an umbrella covering distinct cognitive profiles — autism spectrum, attention-deficit / hyperactivity, specific learning differences, Tourette syndrome, dyspraxia, and others — each with its own neurobiology and clinical criteria.

Autism

The Autism Spectrum: Neurobiology and Cognitive Profile

Autism spectrum disorder is a developmental condition characterized by differences in social communication and information processing, supported by a converging body of evidence from genetics, structural MRI, and functional imaging.

ADHD

ADHD Neuroscience: Dopamine, Networks, and Executive Function

ADHD is a neurodevelopmental condition associated with measurable differences in dopaminergic signaling, prefrontal connectivity, and the default-mode / task-positive network balance that supports sustained attention.

Dyslexia

Dyslexia: The Cognitive and Neural Model

Dyslexia is a specific learning difference rooted in phonological processing and neural reading-circuit differences — not a deficit in intelligence, and well-characterized by decades of neuroimaging research.

Executive Function

Executive Function: How the Brain Plans, Inhibits, and Switches

Executive function is the suite of top-down cognitive controls — working memory, inhibition, and cognitive flexibility — implemented primarily by prefrontal and parietal circuits and central to most neurodivergent profiles.

Sensation

Sensory Processing Differences in Neurodivergent Brains

Sensory processing differences — hyper- or hypo-responsivity across visual, auditory, tactile, and interoceptive channels — are a defining feature of many neurodivergent profiles and are now recognized in formal diagnostic criteria.

Comparison

Neurotypical vs. Neurodivergent: Drawing the Line

The distinction between neurotypical and neurodivergent is a clinical and conceptual boundary built from population norms, functional criteria, and lived experience — not a simple binary.

History

A Brief History of the Neurodiversity Concept

The neurodiversity framework emerged in the late 1990s through the work of sociologist Judy Singer and has since reshaped clinical research, education policy, and workplace design.

Variation

The Science of Cognitive Variation

Modern cognitive science treats variation in attention, memory, perception, and reasoning as the rule rather than the exception — a stance increasingly reflected in personalized medicine and educational research.