[catamorphismic]

> In that case, it can be mathematically shown that you are simply too complicated to be fully correctly simulated by any system that attempts to build a model of your actions simply by external observation of you; you do not produce enough bits in your external actions to uniquely identify the state space of the inside of your head, not even if you turn the entire rest of the universe to the task (literally!).

Really? Which mathematical result is this?

Do scanning techniques such as fMRI and EEG count as external?