In light of World Neurodiversity Celebration Week, researchers at the Hunter Medical Research Institute (HMRI) are delving into a question that resonates with many: Is the apparent increase in neurodiversity due to an actual rise in conditions like ADHD and autism, or are we simply improving our ability to recognize them?
While the number of ADHD and autism diagnoses has surged in recent years, experts suggest that this trend does not necessarily indicate a true increase in neurodivergence. Instead, it reflects a combination of improved research methodologies, expanded diagnostic criteria, heightened public awareness, and a long-overdue emphasis on recognizing these conditions in women and other underrepresented groups.
Recognition vs. Rise
The growing rates of diagnosis are often interpreted as evidence that conditions such as ADHD and autism are becoming more prevalent. However, researchers argue that the numbers reveal a more nuanced narrative about advancements in screening and recognition.
Dr. Laura Roche, a senior lecturer at the University of Newcastle and HMRI researcher, explains that the perception of a rapid increase in neurodivergence may stem from misunderstandings about diagnostic processes. “What the evidence really shows is that our screening tools and diagnostic process are exceptionally good at identifying more individuals who might be neurodivergent and capturing the variability in the lived experience of those who feel that they are neurodivergent,” she states.
Advancements in diagnostic frameworks and clinical awareness have enabled clinicians to recognize a broader spectrum of traits than in the past. Dr. Patrick Skippen, Head of Data Management and Health Informatics at HMRI, emphasizes the role of improved data collection in the apparent rise in numbers. “Better tools and more active screening allow us to have more data,” he says. “This means we’re capturing more, but it doesn’t mean anyone has a higher risk or prevalence.”
In essence, the increase in diagnoses may reflect enhanced visibility rather than a genuine surge in neurodivergence.
What Early Research Missed
The perception of increasing diagnoses can also be attributed to the limitations of early research, which often captured a narrow view of neurodivergence. Many early studies focused primarily on young boys exhibiting more obvious behavioral differences, leading to the oversight of other presentations.
According to Dr. Roche, these early studies tended to reflect researchers’ expectations. “When we think about how we have looked at autism in the past and neurodivergence, it’s mostly those behavioral observations capturing the classical, often male, presentation of some of these types of differences,” she notes.
This narrow focus resulted in the frequent omission of individuals whose experiences did not align with these patterns. Dr. Roche highlights that women, in particular, often develop strategies such as masking, where neurodivergent traits may be hidden or expressed differently compared to males.
Listening more closely to lived experiences is now aiding researchers in identifying the broader range of ways neurodivergence can manifest. Dr. Skippen points out that early datasets created a distorted baseline for research. “Early studies mostly captured whoever made it to referral clinics, which was often boys with externalized behaviors, so lots of people were missed from the data. That set a skewed baseline and we’ve been correcting that with population-based science ever since,” he explains.
Today, population-based research and improved sampling methods are helping scientists build a more representative understanding of neurodiversity.
Why Research Integrity Matters
Understanding trends in diagnosis relies on robust research practices and careful interpretation of data. Dr. Skippen emphasizes that practices such as transparent protocols, data sharing, and peer review help researchers minimize bias and ensure findings are robust.
These safeguards provide scientists with insights into whether changes in diagnostic rates reflect genuine shifts in prevalence or simply improvements in detection. He advises the public to approach media headlines about rising diagnoses with a critical eye. “If different studies don’t have the same denominator, you may as well be comparing apples and oranges,” he warns.
Changes in diagnostic criteria, screening methods, or study populations can all influence reported rates, making direct comparisons challenging. Dr. Roche adds that discussions about diagnosis must also acknowledge the personal realities behind the statistics. “A diagnosis is a lengthy and vulnerable process,” she says. “First you have to go and see a GP and be really open and honest about your challenges, which can put you in a really vulnerable position.”
The process often involves multiple specialist assessments. “Then you will be on a waitlist to see either, if it’s your child, a pediatrician, or if you’re an adult, a psychologist or a psychiatrist.” Depending on where someone lives, the wait can stretch up to a year, and the process can be expensive.
For many individuals, diagnosis represents a significant step toward understanding their experiences. “People aren’t just going and getting diagnosed for the sake of it, it’s a really long life-changing process and there’ll be really strong motivations behind why someone would get diagnosed,” she explains.
Reframing the Conversation
Rather than focusing solely on rising numbers, researchers advocate for a broader understanding of neurodiversity. Dr. Roche explains that while neurodivergent individuals may face challenges, they also bring valuable perspectives and strengths.
“Every neurotype is incredible and should be celebrated,” she asserts. “Alongside those challenges are some really incredible strengths and they are real assets to society.”
Recognizing this diversity means moving beyond simplistic narratives about increasing diagnoses and focusing instead on inclusion, understanding, and support. By looking beyond the headlines and appreciating the science behind the numbers, it becomes clear that neurodiversity has always been part of our communities. What has changed is that research is finally recognizing it more fully and capturing the full range of human experience.
