Comparative psychology Comparative psychology studies have been used by scientists to get intensive information about the human cognitive process and historically find evolutionary roots. Cognition refers to mental processes involved in absorbing knowledge and understanding. These processes are like thinking, remembering, knowing, and judging, which are higher-level brain function and requires imagination, language, perception, and planning. People use rational thinking based on opinion to create knowledge, which is called rationalism. Human beings also use empiricism, which is observing the surrounding world to create an experience. This cognition uses brains working memory to temporarily store the gained knowledge for later use, which can be in thousands. Recent research findings of the evolutionary origin of this cognitive mechanism have shown that working