The third quartile coincided with an IQ of

Sophisticated neuroscientific tools such as the electroencephalogram, which measures electrical activity of the brain, and functional magnetic resonance imaging, which provides pictures of brain activity, have shown us that dreams

a) occur in REM sleep only. b) assist us in destroying painful memories. c) help us understand our experiences and control our emotions. d) are completely meaningless and useless.

Suppose you learn that two children, a 10-year boy and a 10-year old girl, have brains of quite different sizes, with the boy's brain being about 40% larger than that girl's brain

Which of the following conclusions would be the best to draw from this data? a. The girl most likely has something wrong with her brain, because it should be at least 10% larger than the boy's brain. b. The girl's brain most likely has something wrong with it, because it should be very close to the same size as the boy's brain at this age. c. The girl most likely was malnourished in early childhood, giving rise to a smaller-than-average brain. d. There is no reason for concern, since children's brain sizes can vary by as much as 50% without any appreciable difference in cognitive skills.