Final answer:
The left hemisphere primarily handles language functions, and the right hemisphere is associated with spatial and nonverbal reasoning, with both hemispheres working collaboratively through the corpus callosum.
Step-by-step explanation:
The main function of the left hemisphere is language function, while the main function of the right hemisphere is spatial and nonverbal reasoning. While there is some lateralization of function, with certain cognitive processes being more likely to be handled by one hemisphere, it's important to note that many functions are shared across both hemispheres. The corpus callosum plays a crucial role in connecting the two hemispheres, allowing them to communicate and work together. For example, 95% of the population process language primarily in the left hemisphere, which is also connected to the motor and sensory functions of the opposite side of the body. Conversely, the right hemisphere, which controls the left side of the body, is often more involved in tasks that include visual-spatial processing and emotion recognition.