What function is primarily associated with the left hemisphere of the brain?

The primary function associated with the left hemisphere of the brain is language comprehension and production. This is well-established in neuropsychology, as the left hemisphere is predominantly responsible for processing language-related tasks, which include understanding spoken and written language as well as producing coherent speech. Regions such as Broca's area and Wernicke's area, located in the left hemisphere, play critical roles in these processes. Broca's area is involved in speech production, while Wernicke's area is crucial for language comprehension.

Conversely, the right hemisphere of the brain is more associated with functions like artistic expression, emotional processing, and spatial awareness. Therefore, while each hemisphere contributes to various cognitive functions, the left hemisphere is distinctly recognized for its role in language, making it the correct answer in this context.