The ability to interrogate and manipulate electrical activity in the human brain promises to do for the brain what biochemistry did for the body. In crossing this threshold of great promise, difficult ethical quandaries confront us. New methods to stimulate specific brain circuits can treat neurological and mental illnesses and control behavior. Patterns of electrical activity in the brain can reveal a person’s cognition-normal and abnormal. ![]() The ability to detect electrical activity in the brain through the scalp, and to control it, will soon transform medicine and change society in profound ways.
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