Evolutionary psychologists propose that the mind is made up of genetically influenced and domain-specific[4] mental algorithms or computational modules, designed to solve specific evolutionary problems of the past.[5] Cosmides and Tooby also state in a brief "primer" on their website,[6] that "…the brain is a physical system. It functions like a computer," "…the brain’s function is to process information," "different neural circuits are specialized for solving different adaptive problems," and "our modern skulls house a stone age mind."