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Nothing means anything without our brains. Not science, not theology, not politics, not love. Everything we know and do—all the sense of human thought, all the feelings of human emotion, all the fullness of human achievement—all are the product of the brains in our heads. By what processes do human brains work? How much can science discover?

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John Mazziotta, MD, PhD, is the Executive Vice Dean of the David Geffen School of Medicine and Associate Vice Chancellor at UCLA. A distinguished researcher and prolific writer, Dr. Mazziotta is currently Chair of the Department of Neurology, Director of the UCLA Brain Mapping Center, Associate Director of the Semel Institute, and Professor of Neurology, Radiological Sciences and Pharmacology.

Closer To Truth, hosted by Robert Lawrence Kuhn and directed by Peter Getzels, presents the world’s greatest thinkers exploring humanity’s deepest questions. Discover fundamental issues of existence. Engage new and diverse ways of thinking. Appreciate intense debates. Share your own opinions. Seek your own answers.