According to research, during which of the following time periods is generativity most important to an individual?

Sean yawned during a meeting and within a few minutes several others attending the meeting began to yawn. The brain cells activated in others by Sean's yawn are called ______

Fill in the blank with correct word

__________ are a very popular way to assess infant emotional experiences because they serve

such a powerful communicative function to the caregiver and are tied to important action or behavioral tendencies. Fill in the blanks with correct word