Eight-year-old Eric watches as you flatten one of two equal-sized balls of clay into a pancake. Eric says they both still have the same amount of clay. When he is asked how he knows that the ball and the pancake have the same amount of clay, he points out that the pancake could once again be rolled up into a ball, demonstrating that he
a. is now in the preoperational stage.
b. understands the concept of reversibility.
c. is unable to decenter.
d. is no longer egocentric.
B
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Prevention programs for dissociative disorders that target childhood maltreatment have shown
a. variable success. b. overwhelming success. c. no success at all. d. insurance coverage for fraudulent claims.
The leading cause of death among U.S. adolescents in 2007 was
a. cancer b. suicide c. homicide d. accidents e. HIV infection
Approximately 5% of the world's population has either attention deficit disorder or the related condition of:
a) attention deficit hyperactivity disorder. b) autistic disorder. c) Rett's disorder. d) Asperger's disorder.
Baillargeon and colleagues ( 1987; 1991 ) have conducted several classic studies in which young,
premobile infants are shown "impossible" events, such as the appearance of a car passing through a barrier, only to reappear on the other side. How do these researchers interpret the results of their work? A) That an infant's understanding of object permanence is not mastered until six months of age. B) The fact that the premobile infant shows "surprise" when the object reappears means that infants understand object permanence earlier than Piaget once thought. C) The neural mechanisms responsible for visual searching and reaching-grasping are the same. D) Infants will only show "surprise" over reappearance of the object if they are familiar with it.