Human beings have the ability to selectively filter out certain sensations so that we don't experience them

Bleiberg et al. (1993) studied a man who had experienced brain injury in a motorcycle accident

The researchers administered one drug on days 1 and 4, a different drug on days 3 and 5, and a placebo on day 2 in a double-blind procedure. Such a plan illustrates a. a multiple baseline design. b. a panel study. c. an N of 1 randomized clinical trial. d. a cohort-sequential study.

In their research in the 1970s, Klaus and Kennell found that extended contact between mothers and their babies shortly after birth

a. was unimportant to parent-infant bonding. b. resulted in differences in mother-infant interactions two years later. c. was related to social and cognitive differences in the children at age 5. d. was important for boy infants but unimportant for girl infants.