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I've noticed that people often manage to become moderately good at something, but seem to reach some sort of peak at that level and then rapidly start getting worse again.

I've seen this happen with videogames (most notably Starcraft 2), pool games, badminton, and even drawing/painting. People can get from complete beginner to a mediocre level in all these things, and then at some point they will start getting worse at them again. Not all the way back to a beginner level, but far enough to notice a serious difference in results.

If there are no physical changes that are causing this, is there any explanation for this problem with learning?

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Yes, too many possible explanations. What else can you think of that might be relevant? Are your expectations changing? How about your level of interest in the given task? –  Nick Stauner Jul 22 '14 at 11:51
Since they're all just hobbies, my interest in them remained about the same overall until this decline started eating away at my motivation to keep doing them. My expectations stay the same as well, with some I actively play to get better, others are casual and have no real goal. Is it possible to rely too much on a perceived level of competence? –  Slyder Jul 22 '14 at 12:03
It's possible to rely too much on anything. Performance would probably decrease with motivation, but it sounds like the decline started first. Anyway, don't just follow my lead for ideas of what else might be going on – I can only guess, and you're probably in a better position to do that. Any other associated changes that might be relevant? I suppose I could be taking this in the wrong direction anyway...Questions tend to do better here when they're more general than personal. –  Nick Stauner Jul 22 '14 at 12:10
Self-help questions are discouraged on the site. This question was only marginally in that category, but I have edited out the personal aspects to make it more general and to discourage voting to close. Feel free to make any changes to my edits as needed. –  Chuck Sherrington Jul 22 '14 at 19:46
Search for >S Shaped learning curve. It will give you a detailed Answer. –  A Umar Mukthar Jul 23 '14 at 18:06

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