Growth that occurs as a result of change in cell size is

A clinical psychologist wants to understand the behavior of hyperactive children. He decided to focus on Jenny, a six-year-old who has shown signs of hyperactivity. Which research method is the psychologist using?

a) survey b) case study c) experiment d) correlational study

Our tendency to see objects as relatively stable and unchanging despite changing sensory information is called perceptual ________

a. reversibility b. constancy c. closure d. coherency