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Affects, or feelings, are crucial motivators and organizers in our psychological lives. Yet affect and the full range of emotional expressions have been relatively neglected by psychoanalysis since Freud's earliest formulations. This volume, the first in a three-part series addressing the centrality of affect, focuses on pleasure, which Freud believed to be a fundamental quality of affect. Here, psychoanalysts and psychiatrists integrate new understandings from the neurosciences, clinical research and practice, and observational studies of the development of infants and nonhuman mammals, and scholars in the humanities report on the philosophic and aesthetic implications.