The word “neurodivergent” emerged in the early 2000s, coined by autistic activist Kassiane Asasumasu when she was active in online autism forums. But the broader idea it grew from, neurodiversity, traces back to the late 1990s. The concept moved from niche internet communities to mainstream culture over roughly two decades, picking up speed around 2015 when major corporations began building hiring programs around it.
Neurodiversity Came First, in the Late 1990s
The story starts with “neurodiversity,” not “neurodivergent.” For years, the concept was primarily attributed to Australian sociologist Judy Singer, who explored it in her 1998 honors thesis. That same year, journalist Harvey Blume brought the idea to a wider audience in a September 1998 article in The Atlantic titled “On the neurological underpinnings of geekdom.” But recent archival research has complicated that origin story. A 2024 correction published in a peer-reviewed journal argued that the concept of “neurological diversity” was being used years earlier than previously thought, and that both the concept and the theory surrounding it were collectively developed by neurodivergent people rather than originating from a single individual.
Regardless of who said it first, the core idea was the same: neurological differences like autism are natural variations in the human brain, not defects to be cured. This was a direct challenge to the medical model, which treats conditions like autism primarily as pathology within the individual. The neurodiversity framework borrowed heavily from the social model of disability, which holds that people are disabled not by their bodies or brains but by a society that fails to accommodate them. In the classic example, a wheelchair user isn’t disabled by their legs; they’re disabled by a building with no ramp.
How “Neurodivergent” Became Its Own Word
In the late 1990s, Asasumasu was a high school student posting on online forums for people with autism. She noticed a problem: “neurodiversity” was starting to be used as a synonym for autism specifically, with everyone else labeled “neurotypical.” That left no clear word for an individual whose brain worked differently from the norm, and it excluded people with other conditions entirely.
Her solution was straightforward. “You’ve got typical, and what’s the opposite of typical?” she said. She started using “neurodivergent” in her AOL email signature, and the term spread through online autistic communities. It filled a gap that “neurodiversity” couldn’t. Neurodiversity describes the full range of human brain variation (including typical brains). Neurodivergent describes an individual person whose neurological functioning differs from what’s considered standard.
From Online Forums to Organized Advocacy
The language might have stayed in internet forums if not for organized advocacy. In 2006, autistic self-advocates Ari Ne’eman and Scott Michael Robertson founded the Autistic Self Advocacy Network (ASAN). Before ASAN existed, political and policy discussions about autism largely excluded autistic people themselves. ASAN changed that by pushing autistic voices into conversations about law, research, and education. The organization’s work helped educate the broader public on accepting autism rather than framing it solely as something to fix, and its advocacy over the years is considered a key driver of the modern neurodiversity movement.
The Umbrella Got Bigger
One of the most significant shifts in the 2010s was the expansion of who “neurodivergent” included. What started in autism communities broadened into an umbrella covering a wide range of conditions. Today, people use the term to describe themselves if they have ADHD, dyslexia, dyscalculia (difficulty with math), Tourette syndrome, sensory processing differences, obsessive-compulsive disorder, bipolar disorder, social anxiety disorder, Down syndrome, and other conditions that involve the brain functioning differently from the statistical norm.
This expansion was partly what Asasumasu intended. She wanted a general term, one that didn’t box people into a single diagnosis. But it also means the word covers an enormous range of experiences, from a college student with mild dyslexia to someone with high support needs related to autism. That breadth is both the term’s strength and a source of ongoing debate about whether it’s specific enough to be useful in medical or policy contexts.
Not a Medical Diagnosis
“Neurodivergent” is not a clinical term. It doesn’t appear in the DSM-5 (the diagnostic manual used by mental health professionals in the United States) or the ICD-11 (the World Health Organization’s global classification system). No doctor will write “neurodivergent” on a diagnosis form. The conditions that fall under the umbrella each have their own diagnostic criteria, but the umbrella itself is a social and identity-based concept, not a medical one.
This distinction matters because it shapes how the word gets used. In clinical settings, a provider will diagnose ADHD or autism spectrum disorder. In everyday life, at work, in schools, in online communities, people increasingly use “neurodivergent” as a shorthand for brains that process information, emotions, or sensory input differently. It’s a word that came from disabled communities to describe their own experience, and it remains primarily a self-identification term.
When the Mainstream Caught On
The mid-2010s marked the tipping point. Companies like SAP, Microsoft, and Virgin launched targeted neurodiversity hiring programs, initially in technology, finance, and defense industries where certain cognitive profiles offered clear advantages. These weren’t framed as charity. They were talent strategies designed to tap into problem-solving styles that traditional hiring processes screened out. Media coverage of these programs, along with documentary series like “Employable Me,” pushed “neurodivergent” and “neurodiversity” into the vocabulary of people who had never encountered the terms before.
Google Trends data reflects this trajectory. Searches for “neurodivergent” were negligible before 2019, then climbed sharply through the early 2020s as the term saturated social media, workplace diversity conversations, and education policy discussions. The COVID-19 pandemic likely accelerated this, as many adults working and learning from home began recognizing neurodivergent traits in themselves for the first time and seeking evaluation for conditions like ADHD and autism.
So while the intellectual foundations were laid in the late 1990s, and the specific word “neurodivergent” appeared in the early 2000s, the term didn’t become a mainstream cultural fixture until roughly 2019 to 2021. The full arc, from Judy Singer’s thesis to your coworker mentioning their neurodivergent brain in a meeting, took about 25 years.