Answer:
Functionalism
Step-by-step explanation:
According to Functionalists, our brain is capable of conducting very complex activities both consciously and unconsciously. During its operation, the brain will separate different parts of its structure to focus solely on a single task. (For example: the frontal part of the brain focus on cognitive skills, Occipital lobe of the brain focus on vision, etc)
William James popularized this school of psychology in late 1800s. Due to his work on this topic, he was regarded as The father of American Psychology.