Introduction to Psychology 10th Edition by Rod Plotnik,Haig Kouyoumdjian

Exercise 6

During the fourth and last stage, which lasts from about age 12 through adulthood, the individual develops the ability to think about and solve abstract problems logically; this is called the (a) _____ stage. Each of Piaget's cognitive stages is thought to be qualitatively different from the preceding one because each new stage represents the development of some new (b) _____ ability.