On 6/7/2011 10:22 AM, Orchid XP v8 wrote:
> Or how about this: Try pressing the same keys on a keyboard in the same
> complex sequence, with your eyes closed.
>
> Oh, wait... I can actually do that. And I frequently do. On a daily
> basis, in fact. Obviously my brain lacks the "precision" necessary to
> position my fingers to exactly align with the notes even though there's
> no tactile feedback until I actually touch the key...
>
Betting that, sans mechanical failure, or vibration, a robot would wear 
down a very "tiny" spot on each keyboard, following such a complex 
pattern, while humans would have a wider area of wearing. That said, the 
hands, being a high use part, with specific adaptations *may* include 
additional feedback, or more precise control, specifically due to the 
fact that using them *requires* it. Throwing a ball is a bit different, 
it requires larger muscles, more motion, usually doesn't imply/require 
as much precision, and is more dependent on anomalies in the position of 
other limbs, this means a much *larger* number of inputs, more variance, 
and probably less precise control, since you would have to be processing 
feedback for nearly every muscle in the body, to get anything close to 
the same level of precision as your hands, which can remain in a fixed 
position, or resting against something, which minimizes secondary movements.

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