Who first observed that neurons communicate at the synapse via chemicals?

Describe one area of research that has shown promise in reducing some of the physiological effects of aging

What will be an ideal response?

The authors of your text present a study in which monkeys were given a choice between different colors of M&Ms—later, their preference for different colors of M&Ms was reassessed. The researchers found that the monkeys

a. later preferred the choice they had originally disliked. b. reduced their liking for the colors of M&Ms they hadn't chosen. c. reduced their liking for the colors of M&Ms they had chosen. d. only experienced dissonance when they had observed it in other monkeys.