"No system can fully understand itself."

It applies to computers, AI, and, humans. The brain cannot determine how it thinks because the act of thinking actually affects what is being analyzed. Plus, there is no way that the part that is thinking can analyze itself because it it being used.

To think about this on an easier level, apply it to computers: How can the thread that is doing the analyzing be analyzed at the same time? With another thread? You are then affecting the system by affecting processing percentage and throwing off the system analysis.

Or so they say...