“Only a few years ago one could observe, at least among German psychologists, a quite pessimistic mood. After the initial successes of experimental psychology in its early stages, it seemed to become clearer and clearer that it would remain impossible for experimental method to press on beyond the psychology of perception and memory to such vital problems as those with which psychoanalysis was concerned. Weighty 'philosophical' and 'methodological' considerations seemed to make such an undertaking a priori impossible.”

Source: 1930s, A Dynamic Theory of Personality, 1935, p. v.

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Kurt Lewin48

German-American psychologist 1890–1947

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“In its present state of development psychology must be thought of as a young science. There is only one field in which it is relatively well established and in which it has advanced steadily: this is the psychology of sensation and perception. The scientific character of this field is fully recognized. Its findings are based almost entirely on experimental evidence, and even when its theories are in conflict one feels that as far as method is concerned it stands on relatively firm ground. The situation is different with the psychology of will, of needs, and of personality despite the fact that these fields have always attracted popular interest. As recently as fifteen years ago it was assumed that they, by their very nature, were not amenable to scientific methods. The little experimental work that had been done seemed too artificial and abstract to give an insight into the real processes. It was generally accepted that experimental investigations of these elusive and highly complicated processes were intrinsically impossible, at least in so far as human beings are concerned. Thus in Europe these problems were treated in a half-literary, half-philosophical way, and in America the tendency was to study individual differences by means of tests.”

Kurt Lewin (1890–1947) German-American psychologist

Source: 1930s, Principles of topological psychology, 1936, p. 3.

“American psychology inherited its physical body from German experimentalism, but it got its mind from Darwin.”

Edwin Boring (1886–1968) American psychologist

Source: A History of Experimental Psychology, 1929, p. 494

“Wundt initiated the first systematic psychological research programme. This achievement occurred at the same time as his elaboration of a philosophy of science which was anti-inductivist and stressed the priority of explanatory motives. Specifically psychological explanations depended on concepts of psychological causality as manifested in apperceptive or volitional processes. The major differences between the Wundtian and other models of psychological experimentation can be understood in the light of this general approach. Thus experimenters and subjects had to be enlightened collaborators and the role of introspection was more significant in an explanatory than in a purely observational context. Wundt's special requirements for the psychological experiment led him to reject other early models as exemplified by the hypnotic experiment in which the experimenter-subject relationship was closer to what was to become the norm in the twentieth century.”

Kurt Danziger (1926) German academic

Kurt Danziger, "Wundt's psychological experiment in the light of his philosophy of science." Psychological Research 42.1-2 (1980). p. 109; Summary

“Hypnotism is undoubtedly the most important, the most fruitful and far-reaching method of experimental psychology.”

William McDougall (1871–1938) british psychologist

Hypnotism (1945) by Axel Wayne Bacon. In the Preface to the 1960 edition, Nelson-Hall Co., Publishers

“Working in this field I felt that I had begun a task methodologically and technically sound and necessary, the broader elaboration of which could not be expected for decades. Nevertheless it soon became clear that though these problems are difficult, they are by no means impossible to solve. One had only to clear out a number of hoary philosophical prejudices and to set his scientific goal high enough to arrive at explanation and prediction. Today it can no longer be doubted that the questions set, for example, by psychoanalysis are readily accessible to experimental clarification if only appropriate methods and concepts are employed.”

Kurt Lewin (1890–1947) German-American psychologist

Source: 1930s, A Dynamic Theory of Personality, 1935, p. v-vi.

“Because physical theories typically predict numerical values, an improvement in experimental precision reduces the tolerance range and hence increases corroborability. In most psychological research, improved power of a statistical design leads to a prior probability approaching ½ of finding a significant difference in the theoretically predicted direction. Hence the corroboration yielded by "success" is very weak, and becomes weaker with increased precision. "Statistical significance" plays a logical role in psychology precisely the reverse of its role in physics. This problem is worsened by certain unhealthy tendencies prevalent among psychologists, such as a premium placed on experimental "cuteness" and a free reliance upon ad hoc explanations to avoid refutation.”

Paul E. Meehl (1920–2003) American psychologist

Source: [Theory-testing in psychology and physics: A methodological paradox, Philosophy of Science, 34, 2, 1967, 103–115, https://www.journals.uchicago.edu/doi/abs/10.1086/288135]

“The future mathematical statistician needs early contacts with experimental sciences. He needs them because, at this stage of the development of statistics, the expeimental sciences are sources of theoretical problems. Also, he needs them because in almost any imaginable job which he may get after graduation, he will be called upon to apply his theory to experimental or observational problems.”

Jerzy Neyman (1894–1981) Polish statistician

Proceedings of the Berkeley Symposium on Mathematical Statistics and Probability. Vol. 1. http://books.google.com/books?id=p2T2bxyDSLMC&pg=PA48 University of California Press, 1949, p. 48.

“The experimental psychologist… needs historical sophistication within his own sphere of expertness. Without such knowledge he sees the present in distorted perspective, he mistakes old facts and old views for new, and he remains unable to evaluate the significance of new movements and methods. In this matter I can hardly state my faith too strongly. A psychological sophistication that contains no component of historical orientation seems to me to be no sophistication at all.”

Edwin Boring (1886–1968) American psychologist

Source: A History of Experimental Psychology, 1929, p. ix; As cited in: Baldwin R. Hergenhahn (2008). An Introduction to the History of Psychology. p. 5

“The present book is not a methodology of mathematics in the sense that I will systematically show how some teaching matter should taught; it is not even a systematic analysis of subject matter. I hardly ever refer to well-organized classroom experiments evaluated by statistical methods, nor do I cite experimental results of developmental psychology or the psychology of learning. Maybe the most striking feature is that this book contains few quotations. I will try to justify all these features.”

Hans Freudenthal (1905–1990) Dutch mathematician

Source: Mathematics as an Educational Task (1973), p. v;As cited in: Ben Wilbrink (2013)

“But difficulties are things to be overcome even in the elusory branch of research known as experimental psychology.”

William Crookes (1832–1919) British chemist and physicist

Address to the British Association for the Advancement of Science (1898)
Context: A formidable range of phenomena must be scientifically sifted before we effectually grasp a faculty so strange, so bewildering, and for ages so inscrutable as the direct action of mind on mind. This delicate task needs a rigorous employment of the method of exclusion — a constant setting aside of irrelevant phenomena that could be explained by known causes, including those far too familiar causes, conscious and unconscious fraud. The inquiry unites the difficulties inherent in all experimentation connected with mind, with tangled human temperaments, and with observations dependent less on automatic record than on personal testimony. But difficulties are things to be overcome even in the elusory branch of research known as experimental psychology.

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Kurt Lewin48

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