Fill in the appropriate developmental concept for each scenario below (3 pts): 
1.  9-month old Jessica searches for a familiar toy that was taken away and hidden in front of her, which means she understands the concept of _______________ 1pt.
2.  3-year old Sean begins saying grammatically incorrect sentences such as “I want mores” and “Daddy comed home.” This is known as ______________ 1pt.
3.  5-year old Jeremy imitates an act of aggression after watching his favorite TV show. This is an example of learning via _______________ 1pt.
SHORT ANSWER/ESSAY (answer all three). 

Describe the difference between a correlational study and an experiment (e.g., what does each measure?) 2pts.
Compare the abilities of children in Piaget’s preoperational and concrete operational stages of development (early vs. middle childhood) 2 pts.
How does brain plasticity affect development throughout the lifespan? Provide an example (3 pts).