From philosophy to the laboratory: the rise of empirical psychology

The problem was not a lack of questions

The beginnings of empirical psychology cannot be reduced to a single milestone. Before Wundt’s laboratory, researchers had already attempted to study the mind systematically, while quantitative methods were developing in fields such as psychophysics.1, 2 What changed was not the set of questions itself, but the way answers were justified.

Reflection on how the mind works did not disappear. It was gradually supplemented by methods that made it possible to formulate research questions, observe phenomena systematically, and compare results. Researchers could also control the conditions of a study, although only to a limited extent.2, 3

It is difficult to speak of a simple separation of psychology from philosophy. Philosophical questions and hypotheses continued to influence what researchers considered a legitimate subject of study and an appropriate method. Research practices and the standards used to justify claims changed over time.1, 2, 3 In my view, this gradual development of research practices, rather than a single founding moment, best explains the emergence of empirical psychology.

Before the laboratory

The history of empirical psychology did not begin in the nineteenth century. Earlier attempts had already been made to organize knowledge about the mind and ground it in systematic observation.

In 1783, Ferdinand Ueberwasser became a professor of philosophy in Münster. He later changed the title of his position to “Professor für empirische Psychologie und Logik.” In 1787, he published a textbook titled Anweisungen zum regelmäßigen Studium der Empirischen Psychologie für die Candidaten der Philosophie zu Münster. His work became an important reference point in discussions about when psychology could be considered an independent scientific discipline.1

This does not mean that experimental psychology, as the term came to be understood later, had already emerged in Münster. Pfister and Schwarz argue that Ueberwasser’s project did not establish a lasting tradition of scientific psychology. There is also no evidence that it directly inspired later work in psychophysics or Wundt’s research program. His example therefore challenges a simple account of psychology’s origins, but it does not by itself justify moving the birth of modern experimental psychology back to 1787.1

This distinction matters more than the date itself. An early academic program is one thing; a research tradition developed and taken up by successive researchers is another. In Ueberwasser’s case, we have the former, but there is no evidence of continuity between his project and later experimental psychology.1

What measurement changed

One condition for the development of experimental psychology was the emergence of methods that made it possible to study quantitatively the relationship between physical stimuli and sensations. Psychophysics, developed in part by Ernst Heinrich Weber and Gustav Theodor Fechner, used measurements of discrimination thresholds to investigate how changes in a stimulus related to changes in sensation. At the same time, research on reaction time in astronomy, physiology, and psychology contributed to the development of quantitative methods for studying human responses.2

Measurement made it possible to formulate questions more precisely. Instead of simply stating that people differ in how they perceive stimuli, researchers could investigate how much a stimulus had to change for the difference to become noticeable. In reaction-time studies, they could measure and compare response times under specified conditions.2

Mental experience did not, however, become directly measurable as a result. Researchers measured responses, discrimination thresholds, and reaction times, then interpreted them as indicators of mental processes. The measurement result was therefore not the same as an explanation of the process it was intended to represent.2, 3

Measurement changed the problem of interpretation rather than eliminating it. It made quantitative comparisons possible, but it did not provide direct access to every aspect of mental experience. The history of psychophysics shows how researchers attempted to study mental phenomena indirectly by examining relationships between physical stimuli and sensations.2

Why Leipzig mattered

In 1879, Wilhelm Wundt established a psychological laboratory in Leipzig. This date became a symbolic starting point for modern experimental psychology. The methods and questions that shaped the field, however, had been developing much earlier, including in psychophysics.1, 2

The laboratory mattered for more than its use of scientific apparatus. In Kurt Danziger’s analysis, Wundt’s experiment was part of a specific research program and remained connected to his philosophy of science. The differences between experimental approaches reflected both the technical procedures researchers used and the theoretical questions they sought to answer.3

Leipzig’s significance stemmed from the fact that Wundt’s laboratory became a recognized center for systematic psychological research. That does not mean psychology was “invented” there at one particular moment.1, 3

Methods also define limits

Wundt’s work shows why an experiment should not be treated as a procedure independent of the research question. In Danziger’s analysis, the type of experiment and the interpretation of its results depend on theoretical assumptions, not solely on the technical procedure.3

Reaction-time measurements make it possible to describe and compare response times under specified conditions, but they do not, by themselves, establish which mental process accounts for an observed difference. Historical disputes over the interpretation of reaction times show that a theory is needed to explain what a measurement means.2, 3

I do not see this caution as an argument against empirical research on the mind. Rather, I see it as a reminder that observation and measurement must be distinguished from explanation, and that results should be interpreted in relation to a clearly defined theoretical question.2, 3

From a place to a way of knowing

The transition from philosophy to the laboratory involved a gradual development of practices that made it possible to justify claims about the mind more systematically and subject them to criticism. Experimentation did not simply replace earlier reflections. The ways of testing claims and evaluating their justification changed.1, 2, 3

Ueberwasser’s case shows that programs of empirical psychology existed before modern laboratories, although no continuity has been demonstrated between his project and later experimental psychology. Psychophysics and reaction-time research showed what measurement could make possible. Leipzig, in turn, became an important center for systematic psychological research.1, 2, 3

None of these developments, taken alone, explains the entire process. The name of a discipline does not guarantee an established research practice, measurement does not provide direct access to every aspect of experience, and a laboratory does not by itself ensure that results are valid.

I would therefore not reduce the birth of experimental psychology to a single date or discovery. Its history includes early attempts to study the mind systematically, the development of quantitative methods, and the emergence of Wundt’s research program. For me, the main conclusion concerns the method itself: the value of a result depends on how it was obtained, the question it was intended to answer, and the justification for its interpretation.

References

  1. Pfister, Roland, & Schwarz, Katharina A. (2018). Should we pre-date the beginning of scientific psychology to 1787? Frontiers in Psychology, 9, Article 2481. DOI: 10.3389/fpsyg.2018.02481
  2. Sinatra, Maria. (2006). The birth of experimental psychology in Germany between psychophysical methods and physiological theories. Physis: Rivista Internazionale di Storia della Scienza, 43(1–2), 91–131. URL: https://hdl.handle.net/11586/23557
  3. Danziger, Kurt. (1980). Wundt’s psychological experiment in the light of his philosophy of science. Psychological Research, 42(1), 109–122. DOI: 10.1007/BF00308696