The term “experimental psychologist” is considered misleading because it implies these researchers only run controlled experiments, when in reality they use a wide range of methods, many of which aren’t experiments at all. The label also suggests that experimentation belongs exclusively to one subfield of psychology, when virtually every branch of the discipline conducts experiments. It’s a historical artifact that has never fully matched the work it describes.
Where the Label Came From
The term traces back to the late 1800s, when psychology was trying to separate itself from philosophy. Wilhelm Wundt established the first laboratory dedicated to psychological research in Leipzig, Germany in 1879, and his emphasis on controlled experiments to gather objective data gave rise to a new identity for the field. Calling this work “experimental” served a specific purpose at the time: it drew a clear line between the rigorous, lab-based study of the mind and the more speculative, philosophical approach that had dominated before. The label made sense in that era because experiments were what made this new psychology distinctive.
But as the field grew, “experimental” stopped being a useful descriptor. Every major branch of psychology began incorporating experiments into its toolkit, while the researchers who carried the “experimental” label started relying on far more than experiments alone.
Most Research Methods Aren’t Experiments
A true experiment has a specific structure: the researcher manipulates one variable, controls for others, and measures the effect. It’s the gold standard for establishing cause and effect. But psychologists who study cognition, perception, learning, and other core topics regularly use methods that don’t fit this definition.
Non-experimental research in psychology falls into several broad categories. Correlational research measures the statistical relationship between two variables without manipulating either one. Observational research focuses on recording behavior in natural or laboratory settings, again without changing anything. Cross-sectional research compares different groups at a single point in time. Some observational work is qualitative rather than numerical, meaning it can’t even be analyzed with traditional statistical techniques. A classic example is David Rosenhan’s study of psychiatric ward experiences, which was primarily qualitative observation, not experimentation.
Psychologists labeled “experimental” use all of these approaches depending on the question they’re investigating. A researcher studying how memory changes with age might run controlled experiments in some studies and correlational analyses in others. The label captures one tool in a much larger kit.
Every Subfield Runs Experiments
The deeper problem is that the term implies experimentation is unique to one group of psychologists. It isn’t. Clinical psychologists run randomized controlled trials to test whether therapies work. School psychologists test educational interventions. Industrial-organizational psychologists design experiments to evaluate workplace practices. Even forensic and rehabilitation psychologists use experimental designs when their research questions call for it.
Clinical psychology in particular has moved heavily into experimental territory. Clinical psychologists now integrate research methods traditionally associated with “experimental” psychology into their work on treatment evaluation, implementation science, and behavior change. They design intervention studies, evaluate evidence-based treatments, and apply scientific research competencies that overlap significantly with what experimental psychologists do. The boundary between “clinical” and “experimental” has blurred to the point where the labels create a false distinction.
The Label Doesn’t Match Job Realities
If you look at how the U.S. Bureau of Labor Statistics classifies psychologists, “experimental psychologist” doesn’t appear as a standalone category. The official groupings are clinical and counseling psychologists (about 76,300 employed), school psychologists (67,200), industrial-organizational psychologists (5,600), and a catch-all “all other” category (55,300) that absorbs many research-focused psychologists. The profession’s own classification system has essentially moved past the label.
In practice, people doing the work traditionally associated with experimental psychology hold a wide variety of titles. One might be called a cognitive psychologist studying memory. Another might work as an industrial-organizational psychologist conducting workplace research. A third might hold the title of product user researcher at a tech company, designing studies that inform how consumer products are built. The research methods are similar across all these roles, but none of them need the “experimental” label to describe what they do.
Even Psychology’s Professional Organizations Adjusted
The American Psychological Association recognized this mismatch decades ago. In 1949, APA’s Division 3 (Theoretical-Experimental) and Division 6 (Physiological-Comparative) voted overwhelmingly, 243 to 25, to merge into a combined division. The restructuring reflected an understanding that carving off “experimental” as its own category didn’t align with how research psychologists actually worked. The boundaries between theoretical, experimental, physiological, and comparative approaches were too porous to justify separate professional identities.
Why the Term Persists Anyway
Despite all of this, “experimental psychologist” hasn’t disappeared. Graduate programs still use it. Textbooks still reference it. Job postings occasionally include it. The term persists partly out of tradition and partly because it serves as useful shorthand for “psychologist who primarily does research rather than clinical work.” That distinction, between research-focused and practice-focused psychology, is real and meaningful. The problem is that “experimental” is the wrong word for it. It confuses the method (running experiments) with the role (conducting research), and it implies a monopoly on experimentation that no single subfield holds.
A more accurate label might be “research psychologist,” which captures the breadth of methods these professionals actually use without falsely suggesting that other psychologists don’t experiment or that these psychologists only experiment. But naming conventions in professional fields change slowly, and “experimental psychologist” has more than a century of momentum behind it.