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Date: Wed, 09 May 2012 16:27:18 +0300
From: Alex Mizrahi <alex.mizr...@gmail.com>
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Subject: Re: Learning Lisp
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>>> Using the cursor keys is like using
>>> the mouse, you have to leave your home row.

>> No, it's not. It takes order of magnitude less time.

> Where the hell is your mouse? Floating out there among the moons of
> Jupiter? Mine is only about as far beyond the cursor keys as those are
> beyond the alphabetic keys.

It's not so much about distance to mouse as about nature of mouse 
movement -- basically, you cannot position cursor without watching it 
move. (Unless you're a Counter Strike pro who can headshot as soon as he 
sees something.) A process of watching cursor move and coordinating your 
hand is much slower than just sending commands to hands. It takes ~100 
ms just to see something, latency of human sensory input is significant. 
The only way you can do something quickly is to 'buffer' command to 
muscles, but it's not possible with actions which require feedback.