What is the "Smart Encoding Adjustments" option?

While choosing my importing settings, I couldn't help but notice the option "Smart Encoding Adjustments" at the bottom of the MP3 Encoder settings (just above the High-Pass Filter option and buttons).
I searched the discussions, I searched Google, and even the iTunes Help that comes with the software - all to no avail.
Does anyone know exactly what this entails? Maybe it's common sense to someone who knows the ins and outs of how exactly VBR MP3 encoding works, but I just don't know what to assume. I do make the assumption that most people consider it irrelevant, but why would the programmers give it to us as an option? I suppose I could experiment and encode two identical files with Smart Encoding Adjustments being the dependent variable, but I don't know exactly what evidence to look for. File size? Quality?
Whatever. I'm just looking for help and would sincerely appreciate any response that would aid me in my understanding.

Yes, Thanks! It's still quite vague, but I suppose if I'm looking for something extremely technical, I should just learn it on my own and go with other software options.
This is what I got from the article:
"If you choose to customize the MP3 encoding configuration, you can enable the Smart Encoding Adjustments option to allow iTunes to automatically adjust some of the internal parameters to improve the sound quality of converted files based on the original bit rate selection. This can include reducing the number of channels, encoded frequencies, or the sample rates."
I don't quite know how it could improve the sound quality by reducing any of those three variables, but then again, I suppose it all doesn't matter when not working with professional equipment and software.
Thanks for pointing me in the right direction.

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