BrainMass Quizzes Important Individuals in Psychology Can you identify the people associated with key psychology concepts? Test your knowledge with this quiz. 1 Which individual theorized that children had 4 stages of cognitive development including the sensorimotor, preoperational, concrete operational, and formal operational? Vygotsky Piaget Skinner Pavlov None of the above 2 This individual is famous for their sociocultural theory on how children develop. Vygotsky Piaget Skinner Pavlov None of the above 3 This individual was famous for their research displaying how classical conditioning works. Vygotsky Skinner Piaget Pavlov None of the above 4 This individual is frequently associated with their research on operant conditioning. Vygotsky Skinner Piaget Pavlov None of the above 5 This individual's doll research was famously used in Brown v. Board of Education to end school segregation. Kenneth Clark John Davis Phillip Klause Alexander James None of the above Submit Quiz