The role of theory in experimental psychology.
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A short review of the development of experimental psychology from an Estonian perspective is presented. The first rector after the reopening of the University of Dorpat (Tartu) in 1802, Georg Friedrich Parrot (1767-1852) was interested in optical phenomena which he attempted to explain by introducing the concept of unconscious inferences, anticipating a similar theory proposed by Herman von Helmholtz 20 years later. One of the next rectors, Alfred Wilhelm Volkmann (1800-1878) was regarded by Edwin Boring as one of the founding fathers of the experimental psychology. Georg Wilhelm Struve (1793-1864) played an essential part in solving the problem of personal equations. Arthur Joachim von Oettingen (1836-1920) developed a theory of music harmony, which stimulated his student Wilhelm Friedrich Ostwald (1853-1932) to study colour harmony. Emil Kraepelin (1856-1926), the founder of modern psychiatry, is by far the most important experimental psychologist who has worked in Estonia. His successor Wladimir von Tchisch (1855-1922), another student of Wilhelm Wundt, continued Kraepelin's work in experimental psychology. The lives of Wolfgang Köhler (1887-1967), who was born in Reval (Tallinn), and Oswald Külpe (1862-1915), who graduated from the University of Dorpat, extended the link between the history of experimental psychology and Estonia. Karl Gustav Girgensohn (1875-1925), the founder of the Dorpat School of the psychology of religion, stretched the use of experimental methods to the study of religious experience.
The historical emergence of a field devoted to the experimental investigation of effects identified as "social" required a radical break with traditional conceptions of the social. Psychological experimentation was limited to the investigation of effects that were proximal, local, short-term, and decomposable. A viable accommodation to these constraints occurred in the closely related programs of Moede's experimental crowd psychology and Floyd Allport's experimental social psychology. Later, Kurt Lewin attempted to provide a different conceptual foundation for the field by drawing on certain precepts of Gestalt psychology and the philosophy of scientific experimentation developed by Ernst Cassirer. These ideas were poorly understood and were soon replaced by a methodological regime in which a new generation of statistical procedures and experimental design shaped implicit conceptions of the social in social psychological experiments through such procedures as randomization and the additive combination of variables.
Varied research findings have been taken to support the claim that humans' representation of the self is "special," that is, that it emerges from systems that are physically and functionally distinct from those used for more general purpose cognitive processing. The authors evaluate this claim by reviewing the relevant literatures and addressing the criteria for considering a system special, the various operationalizations of self, and how the studies' findings relate to the conclusions drawn. The authors conclude that many of the claims for the special status of self-related processing are premature given the evidence and that the various self-related research programs do not seem to be illuminating a unitary, common system, despite individuals' subjective experience of a unified self.
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In fall 1995, the worldwide-accessible Web Experimental Psychology Lab (http://www.genpsylab.unizh.ch) opened its doors to Web surfers and Web experimenters. It offers a frequently visited place at which to conduct true experiments over the Internet. Data from 5 years of laboratory running time are presented, along with recommendations for setting up and maintaining a virtual laboratory, including sections on the history of the Web laboratory and of Web experimenting, the laboratory's structure and design, visitor demographics, the Kids' Experimental Psychology Lab, access statistics, administration, software and hardware, marketing, other Web laboratories, data security, and data quality. It is concluded that experimental data collection via the Internet has proven to be an enrichment to science. Consequently, the Web Experimental Psychology Lab will continue and extend its services to the scientific community.
Experimental psychological research on performance in relation to age is outlined to show how aims, methods and interests have developed between the pioneering days of the 1940s and the present time. More detailed consideration is then given to the actual and potential applications to studies of aging of the quantitative methods of Information and Signal Detection Theories, and to the importance of taking account not only of correct performance but of the frequency and nature of errors if age changes are to be fully understood. Research in relation to age on continued performance is discussed, including short-term serial effects and the longer terms effects of fatigue, learning and practice, and the need for further research in these areas is emphasised. Guiding principles for future psychological research on aging are briefly urged.
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