Psychologists testing the relationship between environment and development developed the “rat wonderland” experiment. the control group rats were placed in plain cages, and the experimental group rats were placed in enriched cages with colorful patterns, platforms, and ladders. rats that were raised in the enriched cage environments a. had smaller, lighter brains. b. had brains with a thinner cortex. c. were superior at learning mazes. d. exhibited all of these characteristics.

When in college, greg dreamed of rowing in the olympics and becoming a surgeon. now at age 48, he continues to enjoy rowing, although he never made it to the olympics and he works as an anesthesiologist. his wife and kids are healthy and he is basically content. according to erikson, he is most likely to experience

Martin is managing a production line in a manufacturing plant in the midwest. martin has a quality and productivity problem in one part of the manufacturing process. he discovers that his workers aren't sure what to do. when he asks why they didn't ask questions, the universal reply is, "we midwesterners don't ask questions, we just do." martin decides to address this problem by offering recognition rewards for anyone who asks the most job-related questions each month that lead to process improvements. unfortunately, martin finds the program doesn't work. when he further questions his workers, he discovers that no one wants to be the first to ask questions. as a group, workers still feel that they should figure it out on their own and not ask questions. martin finds carmen, one of the workers that everyone else admires, and talks her into being the first to ask questions as part of the program. after about a month, several other people begin to submit questions, and soon everyone in the plant is asking questions. refer to case 6.1. martin's plan failed initially because he didn't consider the power of on attitudes.

The idea that desirable traits can be bred into human beings and undesirable ones can be bred out is known as: