Sorry, but you have this badly reversed. For a short declarative sentence like "the chair is near the window" the brain activates over 90,000,000 X 3,000 or 270 billion computing units that each reach conclusions in under 4 seconds. A computer reaches far fewer program conclusions per second, even the fastest ones. Sadly that tall tale is still lingering out there from the early days of computers when we thought that brains were like computers, which they are not. Here is how your brain actually computes, the main evidence for it, and the main evidence against your explanation.
Even our most powerful computers today are out-computed by a mouse brain.