A steady increase in white matter, nerve fibers that connect distant portions of the brain, permits faster information and better communication across hemispheres
Adolescents move away from their reliance on concrete, real-world stimuli, and develop the capacity for abstract thought
They can now use symbols to represent other symbols, hidden messages, imagine possibilities, create hypotheses
Hypothetical-Deductive Reasoning

Methodical, scientific approach to problem solving, and it characterizes formal operations thinking
Hypothetical-Deductive Reasoning

Involves ability to develop, consider, and test hypotheses
Piaget attributed it to a combination of brain maturation and expanding environmental opportunities
According to David Elkind, the new way of thinking of adolescents, the way they look at themselves and their world, is as unfamiliar to them as their reshaped bodies, and they sometimes feel just awkward in its use
Adolescents can keep many alternatives in mind at the same time yet may lack effective strategies for choosing them
Boys are more likely to fail to achieve a baseline of proficiency in reading, mathematics, and science
Girls do better on verbal tasks that involve writing and language usage
Boys do better in activities that involve visual and spatial functions helpful in math and science