If you define a UTM as having infinite capacity, then a human is not a UTM.
If you are talking about finite TMs, then a smaller finite TM cannot emulate a larger one. A larger finite TM might be able to emulate a smaller one, but cannot necessarily . A human cannot necessarily emulate a TM with less total processing power than a human brain, because a human cannot devote 100% of cognitive resources to the emulation. Your brain is mostly devoted to keeping your body going.
This can easily be seen from the history and methodology of programming. Humans have a very limited ability to devoted their cognitive resources to emulating low level computation, so programmers found it necessary to invent high level languages and tools to minimise their disadvantages and maximise their advantages in terms of higher level thought and pattern recognition.
Humans are so bad at emulating a processor executing billions of low level instructions per second that our chances of being able to predict an AI using that technique in real time are zero.
This is mostly a quantitative issue.
If you define a UTM as having infinite capacity, then a human is not a UTM.
If you are talking about finite TMs, then a smaller finite TM cannot emulate a larger one. A larger finite TM might be able to emulate a smaller one, but cannot necessarily . A human cannot necessarily emulate a TM with less total processing power than a human brain, because a human cannot devote 100% of cognitive resources to the emulation. Your brain is mostly devoted to keeping your body going.
This can easily be seen from the history and methodology of programming. Humans have a very limited ability to devoted their cognitive resources to emulating low level computation, so programmers found it necessary to invent high level languages and tools to minimise their disadvantages and maximise their advantages in terms of higher level thought and pattern recognition.
Humans are so bad at emulating a processor executing billions of low level instructions per second that our chances of being able to predict an AI using that technique in real time are zero.