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Where is the intelligence in the human brain? There are only some electrons and whatnot. No need to invoke intelligent decisionmaking over the processes in the brain, similarly as it is not neccessary to invoke intelligent design with organisms.
Well, OK then. You have really opened the door. The intelligence in the human brain is in quantum-scale charges at the boundary between cell and pathway. These charges are quickly transmitted to the cell at the other end of the pathway. There are a very large number of cells with these pathway connections, and an even larger number of pathways. As scientists come to grips with the myriad chemical, interactions, results, and timing, the human brain will come to understand the human brain. There is no need for intelligent design. Especially when the body of organic chemistry literature is filling in all the gaps.
Intelligence in the human brain is the collection of holographic charge patterns composed of many pathways in a specific 3D charge pattern that each make a "state". Each state is a memory fragment. Series of pre-existing holographic patterns cycle through different parts of the brain simultaneously and continuously. Our senses cycle new environmental data, external stimuli, through these different parts as new holograms during the same cycles. One way to think of this is that the 2 holograms are orthogonal to each other as they interfere and produce a third hologram. The two original holographic patterns overlap each other and produce a new 3rd pattern via constructive and destructive interference. No 2 patterns are ever the same due to the number of elements possible in a 3D pattern. Because there is this stochastic nature to the formation of each hologram, the interference patterns they form are individual and unique. It is stochastic because it is highly highly parallel, concurrent, multi-path, and chemical. Maybe each hologram is unique among all human brains for all time. If there are 10,000,000,000 brain cells and each is connected by 5 axons, the factorial is bigger than my calculator can calculate. It runs out at the number 69. Over my lifetime the number of active brain cells researchers figure there are has crept up to over 1,000,000,000,000. The factorial of 5 trillion is an out of this Universe number. There may be a temporal component to the hologram, meaning it rolls through the charge pathways in a certain sequence. This could mean that the same signal path is used more than once. So the number of potential unique memory fragments that can be stored by our brain is near incalculable. Add to that the chemical biases at work from emotions, chocolate, and caffein, and the tally gets really big. Not bad for $1 worth of chemicals.
The result is a never-ending series of charge-based holograms playing out patterns that move limbs in response to external stimuli, remember things that no longer exist, and postulate new things. The brain works in parallel with its environment, but disconnected from it. Once chance sets the charge pattern for each hologram, the next time this particular pattern is activated, it will be substantially the same and form a substantially similar interference pattern for an external stimulus that is substantially similar to the one that happened previously. I speculate that our subconscience is actually a god-view simulation of us, the world around us, and our place in it that starts running sometime after birth and continues every nanosecond until the day the chemicals and biological constructs supporting the charge patterns deteriorate. While running many holograms per second through its different parts and forming these interference patterns with real-time stimuli, the result is something expected (like before), different in some way, or new. So, we know our place in the world, as it were, and can figure out how to react to new things, old things, or changed things.
In the philosophy of it, life (self-replicating molecules) is like the slime of the Universe. Life will form anywhere it can including the vacuum of space. Life with a brain that stores data about the environment and applies it later is like a first derivative. When the brain manipilates its surroundings to what it perceives is its best benefit, life has reached a new level. Something like a 2nd derivative. What might be the third derivative and are we at the threshold of that now? All this and no intelligent design needed.