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Instead, neuroscience has relied on the data gathered from doing such procedures on mouse and primate models.

But Dr Willie Stewart, a leading researcher at the university's school of neuroscience, urged competitors not to "risk their brain health in the name of sport".

Matthew Li, a senior majoring in neuroscience, said his mother in Sacramento had called him to discuss possibly coming home.

“Psychology and neuroscience research has shown that images and videos that generate a sense of personal meaning can have deep emotional impacts.”

Dr. Kurt Gray is a professor of psychology and neuroscience at the University of North Carolina at Chapel Hill, where he directs the Deepest Beliefs Lab and the Center for the Science of Moral Understanding.