I just noticed a very weird thing that atleast happens to me. I had known for long that this effect applied to me subconsciously, but recently, I just got note of a very concrete example rather than the previous abstract ones.
So, that thing is to read a kind of principle or advice or hack, then absolutely forget it, like you don't even have the foggiest of notion about it. Then, the scenario where that advice is applicable comes up. You do exactly as said in advice. You are asked why you did that. You give some very sound explanation of why you felt you should have done that, but you have absolutely no idea that this was some advice you had read, and had you not read that thing, the chances of you doing that, would have been low. Well, I don't have any evidence for what I would have done had I not read that thing would be not according to the advice, but it seems to me that the thing I did in that scenario is niche enough that it must have been influenced by some degree by the thing I had read.
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Much Later Edit: I think the following tweet by Anu Atluru explains this phenomenon:
the purpose of reading a book isn’t to retain information, it’s to refine your worldview just a little bit with each one
— anu (@anuatluru) January 2, 2024
While reading, we are subconsciously modifying our worldview or internal model in view of new areas of thought extended by the author, if they seem to be true. But from the tweet, it seems not all people do this.