Genetic factors explain ________ percent of the variance in ADHD symptoms, a much higher proportion than for most behavior disorders

Bill hates to clean up after dinner. One night, he volunteers to bathe the dog before cleaning up. When he finishes with the dog and returns to the kitchen, his wife has cleaned everything up for him. Which of the following statements is most likely TRUE?

a. Bill will start cleaning up the kitchen before he bathes the dog. b. Bill's wife has positively reinforced him for bathing the dog. c. Bill's wife has negatively reinforced him for bathing the dog. d. Bill will never bathe the dog again. e. Bill's wife will never bathe the dog again.

According to the article Sound familiar about the ability of newborns to remember speech sounds, infants decreased their response to a sound across trials, indicating:

(a) fatigue (b) experimental bias (c) low interobserver reliability (d) habituation