Re: Depends what you mean by augmentation
"Since most people spend much of their time effectively on autopilot using very little perceptive capacity, technology-mediated augmentation of that baseline would seem a rather heavy handed way to improve performance, whereas learning to pay attention better would ultimately be more economic, probably more effective and quite simple to achieve."
Not necessarily. Research has shown that each person's mental capacity (their CPU speed, you could say) has its limits (varying from person to person) and that perhaps if people aren't paying attention, their mind is on other, more-pressing things. After all, no one's realistically proposed the ol' spike on the steering wheel because there's always the risk of factors outside of our control (the one that springs to mind to me is the suicidal ghost driver).
"Many years ago I underwent some very simple training that permanently improved my perceptive baseline by a very large increment, and it involved no more than a very short and quite lightweight apprenticeship with a teacher and some follow up practice. No mechanics were necessary."
But by the same token, others can try the same thing and just wash out. Do you tell these people (who may be close to you), "Too bad, game over, better luck next life"?
"This has happened in many fields already - the simplest examples being capacities for mental arithmetic and spelling, which have been almost entirely supplanted by calculators and spell checkers."
I don't know about that. Have you seen old texts and so on? I don't think it takes technology to louse something up and swear it's still correct.