This is Piaget's final stage of cognitive growth that involves the ability for abstract and complex thought:

The "feeding tube" study and the "bottomless bowl" study described in your textbook are two examples of creative ways researchers have investigated the factors the influence how much we eat

Describe these studies, the results, and what each one tells us about why we eat and why we stop. What will be an ideal response?

Which is more effective at treating psychological problems, psychotherapy or medication?

a. Research has shown that psychotherapy is the most effective treatment for psychological problems. b. Research has shown that medication is the most effective treatment for psychological problems. c. Research has shown that neither psychotherapy nor medication is significantly better than the other at helping to treat psychological problems. d. The determination of whether psychotherapy or medication is better depends on the person and the condition being treated. Sometimes it is one or the other, and sometimes it is both together.