Not true. The neural connections in the human brain are the most complex arrangement of matter known in the universe. There are more brain states than atoms in the observable universe.
While I'm not sure what you are referring to, and you might not have know what I was saying, I referred to the commonplace belief that people often have that their opinions about other people are accurate.
(but if you like the physical/computational side question of the complexity of nature vs the processing power of the human brain, that's a fun topic, and I'll write out a bit on it here in case that was your interest. The human brain is vastly complex and able to process great complexity also, but it's quite normal that people don't realize the complexity of just Earth as a whole (which of course includes all the life on Earth). First consider the implication if as most you think that the human brain is operating by physics/chemistry, that it is entirely just natural..... But next, consider that together all the atoms of the Earth are in literally physics relationship -- all of those atoms literally interact with the vast complexity of quantum mechanics, with the same laws of physics as a human brain. While sure, you can ignore most of what is happening in the Earth (or rather you
have to do so, as you don't' even have a choice, as even reading all of research about all that is happening on Earth (if you could) would fall far short of all that is happening on Earth) -- and it's good and best if you do so, as you need to function.... But, back to the topic of complexity of nature vs the processing power of the human brain... We can consider that the quantum mechanical complexity of the Earth exceeds that of a much smaller part of Earth like a 3 pound brain, especially since Earth very vastly many complex subparts (such as billions of human brains for instance)
as a part of itself. But even just the non-living total interaction of all the atoms of earth together is physics operating, so that the complexity in full total nuance of all the non-living parts of Earth (if we abstractly imagine totally knowing how all atoms will operated in relation over time) is proportional to their number of particle constituents. Literally all the atoms are like a vast network of physical interaction, so we can only look for simplified broad patterns we might discern that are useful, and so of course we choose to investigate and know those (those simplifications). We can find some useful very simplified patterns == for example weather patterns sufficiently broad/repeatable enough to make probabilistic predictions on a given day (though a couple of decades later we might have to have modified a weather forecasting model used quite a lot as climate changes altered patterns compared to some of the old models we used, so that rainfall amounts exceeded what older models from 20 or 30 years prior would have predicted, etc.) But finding some
useful degree of probability in a broad pattern (like area rainfall over 72 hours) to be able to make an often ballpark useful prediction (not always reliable, but working pretty often...)
isn't at all close to beginning to be able to predict the
totality of Earth evolving over time in a
full way (we have to try to model
small parts that are more predictable in ways that we can use temporarily often enough to benefit).
See what I mean yet? We are only modeling very simplified limited bits of Earth at a time.... And attempting to model future climate or earthquakes or volcanoes or solar storms, etc., etc., -- that is the work of often dozens or sometimes even hundreds of minds over decades of time put into computer models, but still they are only of very limited accuracy, often predicting X, but Y happens instead (such as predicting rain in an area at 60% and then sometimes only 10% of the area gets even a trace, as such model failure happens at times).
Next though, Earth as a whole includes all the life on Earth, and therefore of course all human brains, etc.... See? Can one person know in
detail all about all persons? (only yes for the most simplified things like about how many are alive right now within a certain degree of estimation accuracy probability, or what is the so far estimated mortality rate of the strain of covid that was first sequenced about only 2 or 6 months ago....).
So, overall, Earth's
full complexity (which includes all human brains, all life on Earth) very vastly exceeds the processing power of a single human brain in regard to
precise full detail.
But above in my prior post, I wasn't even talking of very simplified things like weather forecasting, but the more typically discussed things people think they know much about, like what other people are thinking politically and so on.... Like for instance, some people I talk to that speculate to me about the motivations of 'democrats' or 'liberals', and they have wildly wrong notions....
We know even less about what other people are thinking than we guess.
