My work impacts half the world who develop age-related hearing loss with difficulty understanding speech in noise. To understand how the brain solves the cocktail party problem, I need to record from neurons suitable only in animals. Monkeys are best suited for this given our similar auditory brains. I use sounds without semantics & fMRI to show that monkeys use similar brain regions as humans to separate overlapping sounds. I'm first to develop an animal model of human auditory segregation. Now, I can record from neurons in monkeys and understand how human brain solves this problem!