In the opening vignette of the chapter on sleep, Michael suffered from

While discussing the functions of the brain stem, the lecturer notices that many of his students appear to have fallen asleep

This reminds him of the ________, which arouses the cerebral cortex to attend to new stimulation and keeps the brain alert even during sleep. a. pons b. medulla c. cerebellum d. reticular formation

Sandra is 11 years old, and reasons at Piaget's concrete operational stage of development. Which task is likely to be beyond her ability to solve?

A) sort a set of dolls by their height B) sort a set of imaginary objects by weight C) sort a set of baseball playing cards by team D) solve all of these tasks