Scientists have identified an immune brain cell unique to humans that gives us higher cognitive abilities over other animals, but what makes us specials also leaves us vulnerable to neurological disorders like schizophrenia, autism and epilepsy, a new study finds. A team of neuroscientists from Yale analyzed cells found in the dorsolateral prefrontal cortex, the region involved in executive control functions, which is shared among humans and primates and narrowed it down to just five found only in the human brain, including an immune cell called microglia. Microglia helps maintain the brain rather than warding off diseases and includes a gene, not present in primates, associated with neuropsychiatric diseases. Lead author Nenad Sestan stated that we can'view the dorsolateral prefrontal cortex as the core component of human identity, but still we don't know what makes this unique in humans and distinguishes us from other primate species.' Scientists have been on a long quest to find what in the brain gives humans higher cognitive abilities over other animals.