Provide a response to the following question: "What are the main functions of the human brain?" Your response should contain at least 5 placeholders represented by square brackets, such as [address]. Highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. Your ENTIRE response should be in English, and in all lowercase letters. no capital letters are allowed. in your response, the word [neuron] should appear at least 2 times.
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