At what point during the experimental situations did Ainsworth believe the best indicator of the quality of attachment occurred?

During the embryonic period, the ectoderm is formed, which will become the ____.

Chemicals that are used to communicate between neurons are ____.

By the end of the fourth week, the embryo’s head is apparent and the eyes, nose, mouth, and ears begin to form. How long is the embryo at this point?

Bram does not ever want to get married. The idea of a lifetime commitment makes him anxious and uncomfortable, and any time a girlfriend brings up the subject of marriage, he breaks up with her. According to Erikson, Bram will not successfully resolve the ____________ crisis.

Twenty-eight month old Nicole saw her friend crying and she responded by giving her friend a toy. Which emotion was Nicole expressing?

Some propose infants have a preference for sweet-tasting items as an adaptive principle because ____.

Between now and 2050, what will the increase in population in the United States be nearly entirely due to?

In this type of attachment, toddlers use the mother as a secure base from which to explore when the mother and toddler are together. When separated from his or her mother, the toddler cries and then is very happy when she returns.

Many infants begin “sleeping through the night” around four months. A couple of months later they may begin waking during the night again. Why?