While most would agree that the birth of psychology as a science took place in Leipzig, Germany, in 1879, when Wilhelm Wundt established the first laboratory for studying psychological phenomena, there is no clear record of the first use of experimentation. Regardless, there is no disputing the attraction that this method of research has had for many psychologists in the twentieth century. Psychologists clearly recognize the usefulness of the experiment in investigating potential causal relationships between variables. Hence, experimentation is employed widely across the subfields of psychology, including developmental, cognitive, physiological, clinical, industrial, and social psychology.

This is not to say that all psychologists are completely satisfied with experimental research. It has been argued that an insidious catch-22 exists in some experimental research that limits its usefulness. The argument goes like this: Experimenters are motivated to control rigorously the conditions of their studies and the relevant extraneous variables. To gain such control, they often conduct experiments in a laboratory setting. Therefore, subjects are often observed in an artificial environment, engaged in behaviors that are so controlled as to be unnatural, and they clearly know they are being observed—which may further alter their behavior. Such research is said to be lacking in ecological validity or applicability to "real-life" behavior. It may show how subjects behave in a unique laboratory procedure, but it tells little about psychological phenomena as displayed in everyday life. The catch-22, then, is that experimenters desire control in order to establish that the independent variable is producing a change in the dependent variable, and the more such control, the better; however, the more control, the more risk that the research may be ecologically invalid.

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