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In this insightful new book on the remarkable William James, the American psychologist and philosopher, Krister Dylan Knapp provides the first deeply historical and acutely analytical account of James's psychical research. While showing that James always maintained a critical stance toward claims of paranormal phenomena like spiritualism, Knapp uses new sources to argue that psychical research held a strikingly central position in James's life. It was crucial to his familial and professional relationships, the fashioning of his unique intellectual disposition, and the shaping of his core doctrines, especially the will-to-believe, empiricism, fideism, and theories of the subliminal consciousness and immortality. Knapp explains how and why James found in psychical research a way to rethink the well-trodden approaches to classic Euro-American religious thought, typified by the oppositional categories of natural vs. supernatural and normal vs. paranormal. He demonstrates how James eschewed these choices and instead developed a tertiary synthesis of them, an approach Knapp terms tertium quid, the third way. Situating James's psychical research in relation to the rise of experimental psychology and Protestantism's changing place in fin de siècle America, Knapp asserts that the third way illustrated a much broader trend in transatlantic thought as it struggled to navigate the uncertainties and religious adventurism of the modern age.

Vision is one of the most active areas in biomedical research, and visual psychophysical techniques are a foundational methodology for this research enterprise. Visual psychophysics, which studies the relationship between the physical world and human behavior, is a classical field of study that has widespread applications in modern vision science. Bridging the gap between theory and practice, this textbook provides a comprehensive treatment of visual psychophysics, teaching not only basic techniques but also sophisticated data analysis methodologies and theoretical approaches. It begins with practical information about setting up a vision lab and goes on to discuss the creation, manipulation, and display of visual images; timing and integration of displays with measurements of brain activities and other relevant techniques; experimental designs; estimation of behavioral functions; and examples of psychophysics in applied and clinical settings. The book’s treatment of experimental designs presents the most commonly used psychophysical paradigms, theory-driven psychophysical experiments, and the analysis of these procedures in a signal-detection theory framework. The book discusses the theoretical underpinnings of data analysis and scientific interpretation, presenting data analysis techniques that include model fitting, model comparison, and a general framework for optimized adaptive testing methods. It includes many sample programs in Matlab with functions from Psychtoolbox, a free toolbox for real-time experimental control. Once students and researchers have mastered the material in this book, they will have the skills to apply visual psychophysics to cutting-edge vision science.