Where our reaction to stimuli goes depend mostly on the emotional brain. If we are afraid it sends the signal to the reptile brain and we only reacts. If we feel pleasure the signals may go to the thinking brain and we may learn from the experience. Every second the brain can receive, evaluate, sort and store and process approximately 10 million information signals from our eyes, one million impulses from skin receptors among other things. No computer in the world can do that.
Supercomputers are to be compared to the brain of the common house fly.
So the brain can not be compared to a computer. The structure of the brain s neurone connections are loose, flexible and very redundant. During our lifetime the brain changes with use. Mental concentration and efforts is for the brain like exercise for the muscles. It alters the physical structure of the brain.