Several experiments showed that short-term memory fades rapidly unless it is rehearsed. One possible explanation is decay. What is another likely explanation?

The Pygmies of Central Africa and the Arapesh of New Guinea live in peace and harmony. Formerly peace-loving, the Iroquois became a fierce and aggressive Native American tribe in the seventeenth century. These examples illustrate that

A) humans will always eventually exhibit aggressive tendencies. B) in humans, innate behavioural patterns, including aggression, are infinitely malleable and modifiable. C) there are strong regional differences in the endorsement of aggression as a solution to social problems. D) humans, lacking inhibitory mechanisms, must rely on cultural norms to curb aggression. E) frustration often contributes to aggression in otherwise peaceable societies.

It's a beautiful day, with just a few clouds in a deep blue sky. The fact that the clouds look closer to you than the sky is an example of

a. color afterimages. b. change blindness. c. perception of figure and ground. d. the law of proximity.