You're right if that were the case, but all sensory organs have specific neural connections, which are directly routed to the appropriate section of the brain, ie. colors of light are received by the eye and must pass through the optical neural system, which translates and sends the information directly to the "visual department". The term "neural network" does not exclude specialized neurons which are directly connected to our 4 fundamental receptors, each adapted as efficient transmitters of specific signals. They are all part of the system. Look at the variety of cables used in a computer, each occupying a port which only translates specific information in the ever more efficient (human designed) configuration. https://en.wikipedia.org/wiki/Sensory_nervous_system I believe that's the idea, except it is not a deliberate action. The brain does all the work as efficient as it is able. What makes you think the source of sound cannot be approximated. We possess stereo vision, stereo hearing, stereo smell and by the use of two arms to touch, we achieve 3D touch. All of them can work individually or in tandem, depending on the various sources of origin, tocome to a best guess of what is being consciously experienced. As always I keep coming back to the "mirror neuron system" which is the processor of input from the external world and offers cognition by association and recognition from memory of previous associations. The sections where memories of experiences are stored and occasionally accessed. This would account for gradual memory loss of memories a long time ago. They are being replaced by newer memories.