Autism has almost certainly existed for as long as humans have, but it wasn’t identified or named until the early twentieth century. The word “autism” first appeared in 1911, the condition was formally described in 1943, and it didn’t receive its own official diagnostic category until 1980. That timeline means our understanding of autism spans barely a century, even though the traits themselves are far older.
The Word “Autism” Appeared in 1911
Swiss psychiatrist Eugen Bleuler coined the term “autism” in his 1911 text on schizophrenia. He wasn’t describing what we now call autism spectrum disorder. Instead, he used the word to describe a specific feature of schizophrenia: a withdrawal from reality so complete that it excluded other people. For Bleuler, autism meant “detachment from reality, together with the relative and absolute predominance of the inner life.” The word comes from the Greek “autos,” meaning self.
For the next three decades, “autism” remained a descriptor within schizophrenia research rather than a condition in its own right. That changed in the 1940s, when two researchers working independently turned the term toward childhood development.
The 1943 Paper That Defined Autism
In 1943, child psychiatrist Leo Kanner at Johns Hopkins published “Autistic Disturbances of Affective Contact,” describing eleven children he had been studying since 1938. These children shared a striking set of behaviors: preoccupation with objects, repetitive speech and movements, an insistence on sameness in their environment, and what Kanner called “extreme aloneness.” They related far better to inanimate objects than to people, reacted with horror to loud noises and moving objects, and often failed to recognize or respond when being picked up.
Kanner interpreted these patterns as a fundamental inability to relate to other people, something present from the very beginning of life. This was the first clinical portrait of autism as a distinct condition, separate from schizophrenia, and it shaped how doctors understood autism for decades.
A Parallel Discovery in Austria
Just one year later, in 1944, Austrian pediatrician Hans Asperger published his own account of children with what he called “autistic psychopathy.” Working independently of Kanner and apparently unaware of his paper, Asperger described children who lacked social instincts from birth. They had stereotypic movements like rocking, hopping, and rhythmic banging. They struggled with the unspoken social rules that other children absorb automatically.
But Asperger also noticed something Kanner’s descriptions had not emphasized: special interests that enabled these children to achieve extraordinary levels of performance in specific areas. He described them as needing to learn social behavior through conscious intellectual effort rather than instinct. He also noted that his patients were almost exclusively boys. Asperger’s work, published in German during wartime, remained largely unknown in the English-speaking world until the 1980s.
The “Refrigerator Mother” Detour
For roughly two decades after Kanner’s paper, the dominant theory blamed autism on emotionally cold parenting. Kanner himself contributed to this idea, describing autism’s cause “in terms of emotional refrigeration” and pointing to a supposed lack of parental warmth. This “refrigerator mother” theory caused enormous harm to families already dealing with a challenging diagnosis.
The theory began to crumble in 1964, when psychologist Bernard Rimland published “Infantile Autism,” a book that systematically argued for biological rather than psychological causes. By 1969, Kanner himself publicly reversed course at a meeting of the National Society for Autistic Children in Washington, D.C., stating that he “acquitted the parents” and that autism was innate. The shift toward understanding autism as a neurological difference, not a parenting failure, was underway.
Autism Gets Its Own Diagnosis in 1980
Despite being described in the 1940s, autism didn’t appear as a standalone diagnosis in the American Psychiatric Association’s diagnostic manual until 1980. The DSM-III listed it as “Infantile Autism” and required that all of the following be present before age 30 months: a pervasive lack of responsiveness to other people, major deficits in language development (with peculiar speech patterns like echolalia or pronoun reversal if speech existed), and bizarre responses to the environment such as resistance to change or unusual attachments to objects.
These criteria were narrow by today’s standards. Over the following decades, the diagnostic framework expanded. The DSM-IV, published in 1994, split autism into four separate diagnoses: autistic disorder, Asperger’s disorder, childhood disintegrative disorder, and the catch-all “pervasive developmental disorder not otherwise specified.” But researchers found that these categories weren’t applied consistently across different clinics and treatment centers, creating confusion for families and uneven access to services.
The 2013 Shift to a Single Spectrum
In 2013, the DSM-5 collapsed all four diagnoses into one: autism spectrum disorder (ASD). The rationale was that a single umbrella diagnosis would better reflect reality, since the traits vary in intensity from person to person rather than falling into neat subcategories. The spectrum framework lets clinicians account for wide variation in symptoms and behavior while using one consistent label.
This change had trade-offs. Research has shown that the DSM-5 criteria can exclude more people with milder traits, as well as girls and older individuals, than the previous version did. The more recent ICD-11, the international diagnostic system, attempts to address this by highlighting that women and older people sometimes mask their autism traits, making the condition harder to spot with standard criteria.
Autism Before the Diagnosis Existed
The fact that autism wasn’t named until 1911 or clinically described until 1943 doesn’t mean it’s a modern phenomenon. Historians and researchers have looked back through historical records and identified individuals who likely would meet today’s diagnostic criteria. Victor of Aveyron, the so-called “Wild Boy” found living alone in the French woods in 1800, is one of the most discussed cases. His behaviors, documented extensively by physician Jean-Marc Gaspard Itard, have led scholars in the history of psychiatry to consider him a possible early example of developmental disability, including autism.
Other historical accounts describe individuals with patterns of social isolation, intense fixations, repetitive behaviors, and language differences that align with what we now recognize as autism. Before the diagnosis existed, these people were variously labeled as eccentric, feebleminded, peculiar, or simply odd. Many were likely institutionalized or marginalized without anyone understanding the neurological basis of their differences.
Rising Prevalence Is About Detection
The most recent CDC data, from the Autism and Developmental Disabilities Monitoring Network’s 2022 surveillance year, identifies about 1 in 31 children (3.2%) as having autism spectrum disorder. That’s a dramatic increase from earlier estimates. In the year 2000, the same network’s combined prevalence was a small fraction of today’s figure.
This rise reflects broader diagnostic criteria, greater awareness among parents and clinicians, better screening tools, and the inclusion of children who would previously have received a different diagnosis or no diagnosis at all. The actual rate of autism in the population may not have changed nearly as much as the numbers suggest. What changed is our ability to recognize it.
Autism, in short, is as old as humanity. Our understanding of it is barely a hundred years old, our formal diagnostic criteria are only about forty-five years old, and our current framework of a single spectrum is just over a decade old. The condition didn’t emerge recently. We just finally started seeing it.