__________ are especially prone to lasting difficulties

According to Harry Harlow's research, contact comfort is vital to development because it

A) ensures the continuation of the genome. B) stimulates the endocrine system. C) ensures that the infant will receive food. D) is the foundation for attachment.

All of the following is characteristic of the Litton study EXCEPT:

A) memories were rated for saliency and emotionality B) undergraduate research participants reported daily memories C) memory for everyday events gradually become less available D) the forgetting curve was linear E) every month two cards were drawn to be recalled