Stephen M. Kosslyn (born 1948) is an American psychologist and neuroscientist. He is a former chair of the psychology department and dean of social sciences at Harvard University, where he is a professor emeritus. Kosslyn is also the president of Active Learning Sciences, Inc., which provides AI software to educational companies.
Work
Kosslyn was an early contributor to cognitive science and then was one of the founders of cognitive neuroscience. His research areas include mental imagery, the neural bases of visual cognition, and the science of learning. Kosslyn's research addressed the "imagery debate," a long-standing controversy in cognitive science over whether mental images are depictive or propositional. Beginning with computational modelling studies in the 1970s and later incorporating neuroimaging and transcranial magnetic stimulation research, Kosslyn argued that multiple lines of evidence supported the depictive view of mental imagery. In 2015, he and Joel Pearson co-authored a paper The Heterogeneity of Mental Representation: Ending the Imagery Debate.
Mental imagery Kosslyn has researched mental images. His studies demonstrated that people take longer to mentally scan greater distances across objects in their mental images. He also found that people could detect more details of objects in their mental images when they mentally "zoomed in" on them. In addition, he documented that the size and shape of the "mental screen" on which visualized objects appear is similar in scope and shape to the field of visual attention in perception (when actually seeing, not visualizing with eyes closed). He and his colleagues also demonstrated that depictive visual mental imagery can be implemented in computational systems. These models posited that visual mental imagery relies on distinct sets of processing components.
Visual cognition Kosslyn proposed a detailed theory of how visual information is stored and accessed in the brain during cognition. According to this theory, visual mental images are generated into the occipital cortex when we need high resolution. After they are generated into this structure, they can be interpreted and transformed via interactions with specific other brain areas. Kosslyn and his colleagues showed that the left cerebral hemisphere relies on "categorical" spatial representations, whereas the right cerebral hemisphere relies on metric, "coordinate", representations. Kosslyn and his colleagues showed that visual mental imagery relies on most of the same brain regions that underlie visual perception. Kosslyn's research has examined individual differences in cognitive style, including distinctions between object visualisers, who tend to process detailed pictorial images, and spatial visualisers, who tend to process spatial relationships and transformations. His studies have also examined the implications of these differences for cognitive processing and education. Kosslyn has also conducted research on the neural correlates of deception, including studies investigating patterns of brain activity associated with different forms of deceptive behaviour. In addition, he was involved in the development of the MiniCog Rapid Assessment Battery, a portable cognitive assessment system developed with funding from NASA and the National Space Biomedical Research Institute for evaluating cognitive performance during long-duration space missions.
Cognitive science in education Kosslyn has attempted to apply principles from cognitive science to improve how people learn, such as using cognitive principles to make data displays—such as graphs, charts, and diagrams—easier to understand. He developed guidelines for creating effective PowerPoint slides and other forms of visual communication. Kosslyn has also proposed ways to design online courses based on principles from cognitive science. Kosslyn proposed the concept of the "Cognitive Amplifier Loop"—a procedure that is intended to help humans interact with AI.
Biography Kosslyn attended graduate school at Stanford University and received a PhD in psychology from Stanford in 1974. After an appointment as assistant professor of psychology at Johns Hopkins, he joined the faculty at Harvard in 1977, where he later served as the departmental chair, Dean of Social Sciences, and the John Lindsley Professor. He also was codirector of the Mind of the Market Lab at Harvard Business School and was an associate in the department of neurology at the Massachusetts General Hospital. In 2010, Kosslyn was appointed director of the Center for Advanced Study in the Behavioral Sciences at Stanford University. Following this, Kosslyn was the Founding Dean and Chief Academic Officer of the Minerva Schools (now Minerva University). He then was the founder and chief academic officer of Foundry College, an online two-year college. He is founder, president and CEO of Active Learning Sciences, Inc. Awards Kosslyn has won include the National Academy of Sciences Initiatives in Research Award, three honorary doctorates (from the University of Caen, France; the University of Paris-Descartes, France; the University of Bern, Switzerland), and a Guggenheim fellowship, He was elected to the American Academy of Arts and Sciences, and the Society of Experimental Psychologists.
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