Rats raised in environments that had cages decorated with colorful patterns and filled with platforms, ladders, and cubbyholes
a. became confused and withdrawn.
b. became more aggressive and territorial in their behavior.
c. developed a larger, heavier brain with a thicker cortex.
d. were no different in physical or behavioral characteristics than the rats raised in the standard laboratory cages.
C
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As with all other dimensions of brain development, myelination of the brain is complete by the end of childhood.
a. true b. false
Mark, who is 14 years old, notices that recently he has become much clumsier. One reason the text suggests for this clumsiness is that the adolescent growth spurt is often accompanied by:
a. asymmetrical growth in legs, feet, arms, and hands b. excess body fat is being deposited in the breasts, which will later disappear c. a short-term reduction in the size of the motor cortex in the brain d. the overproduction of red blood cells that provide excess energy in the muscles