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Michele A. Bassoa,1 aFuster Laboratory of Cognitive Neuroscience, Departments of Psychiatry and Biobehavioral Sciences and Neurobiology, Semel Institute of Neuroscience and Human Behavior and Brain Research Institute, David Geffen School of Medicine, University of California, Los Angeles, CA 90095 Gustav Theodor Fechner defined the field of psychophysics as the study of the relationship between the physical properties of stimuli and the internal responses or perceptions they evoke. Since the mid-19th century, psychophysics has evolved into a very powerful field of study exploring the inner workings of the mind. Carefully designed and well-controlled psychophysical experiments have revealed some of the most fascinating aspects of our brains. Think about visual illusions. How is it that we can “see” things that are not there? How is it that we can look at one…


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