Although hunger naturally occurs in response to an empty stomach, we can easily become conditioned to feel hunger at certain times of the day due to classical conditioning. In this case, the US would be the ____

Physiologically, with mild unpleasant stimulation, the sympathetic division of the autonomic nervous system is more active, and with mild, pleasant stimulation, the parasympathetic division is more active

a. true b. false

The NICHD Study of Early Child Care followed children and their families for 7 years. It was an ambitious and comprehensive study, but a major limitation of this study is that ____

a. not enough families were followed for the 7 years b. children were not randomly assigned into child-care groups c. children's child-care experiences were not influenced by other variables d. the research methods were too old fashioned