Final answer:
The difference in how emotions are expressed by Americans and Japanese is due to different cultural display rules, which are guidelines within each culture that dictate the appropriate expression of emotions.
Step-by-step explanation:
The difference between how Americans and Japanese express anger and fear can be explained by Different cultural display rules. While the ability to produce and recognize facial expressions of emotions is universal, cultural display rules dictate the appropriateness of expressing certain emotions in various circumstances. For example, in American culture, it may be more acceptable to openly express anger and fear, whereas in Japanese culture, there is a greater tendency to keep such emotions more contained. Matsumoto's research into cultural display rules provides evidence of these differences in emotional expression between cultures.