Which part of the brain is responsible for thought processes and reasoning?

The cerebrum is the part of the brain that plays a crucial role in thought processes and reasoning. It is the largest and most developed area of the brain, responsible for higher cognitive functions, including decision-making, problem-solving, and planning. The cerebral cortex, which is the outer layer of the cerebrum, contains areas dedicated to processing information related to language, sensory inputs, and executive functions.

The cerebellum, while important for coordination and balance, is not primarily involved in reasoning or thought processes. The brainstem is responsible for regulating vital functions such as breathing and heart rate, rather than higher-level cognitive abilities. The limbic system is associated with emotions, memory, and behavioral responses, but it does not govern the complex reasoning and analytical skills typically attributed to the cerebrum. Thus, the cerebrum's specialized functions make it the key area for thought and reasoning in the brain.