BARRY LEONARD JACOBS, professor emeritus of psychology and the Princeton Neuroscience Institute, died Jan. 10 in Princeton. He was 77. Jacobs joined the faculty in 1972 and transferred to emeritus status in 2017. He served as director of the neuroscience graduate program for more than a decade. He dedicated his career to brain research, studying the brain mechanisms of sleep, the brain chemical serotonin, and the impact of hallucinogens and other psychoactive drugs on the brain. The author or editor of six books, Jacobs was known for his ability to translate the technical sciences in a clear and engaging way for undergraduate students.