Final answer:
True lateralization means that there is a specialization of function in each hemisphere of the brain, with the left hemisphere primarily involved in language and the right hemisphere in spatial reasoning. Each hemisphere also controls the opposite side of the body. The simplification of 'left-brained' or 'right-brained' personality traits is largely a myth.
Step-by-step explanation:
The statement that language ability has different roles in each hemisphere is true regarding lateralization. Lateralization refers to the specialization of function in one hemisphere of the brain over the other. It is well-established that the left hemisphere is generally more involved in language functions for most individuals, while the right hemisphere is associated with spatial and nonverbal reasoning. Moreover, each hemisphere controls the opposite side of the body, meaning that the left side of the brain receives messages from and sends commands to the right side of the body, and vice versa.
Contrary to popular belief, the notion that people are either 'left-brained' or 'right-brained' based on their personalities and skills, such as being artistic or creative, is an oversimplification. While certain functions may be predominantly associated with one hemisphere, many cognitive functions, including language, are distributed across both hemispheres of the cerebrum.