__________ designs are cases where we can manipulate some, but not all, independent

What is the most accurate statement about sleep and memory?

a. During sleep, neurons in the hippocampus are silent b. During sleep, more than 100 genes decrease their activity c. "offline" replay that occurs during sleep helps the cortex undergo LTP d. Contrary to what researchers expected, sleep has no measurable effect on memory

People who are psychologically __________ are less likely to become ill under the impact of stress

a. hardy c. optimistic b. easy going d. all of these