The overwhelming popularity of the mouse and the limited availability of the thumb operated trackball has me perplexed. For example, a brief look at Logitech's web site shows 26 various mice and only one thumb operated trackball. I have always used a trackball because, for me, it has so many advantages over mice.
These are some of the advantages I like about a trackball:
1. I only have to move my thumb instead of my whole arm. (yes, I'm that lazy)
2. It doesn't take up as much valuable real estate on my desk to move from one side of the screen to the other.
3. To change positions of my arm after long hours at the computer I can place it on my knee or the arm of the chair. Try that with a mouse!
4. Improved accuracy and less fatigue due to the far superior fine motor skills of the thumb versus the arm muscles.
5. I never have to pick up my trackball and move it, to get the pointer a little further across the screen.
The advantages of the mouse:
1. It cost less.
2. Mice burn more calories than trackballs! (I can't think of any more. Help me out here.)
(click the cortical homunculus for wiki)
From a bio-mechanical perspective, the thumb operated trackball is far superior to the mouse (or any other trackball design). There is a point to point correspondence between the sensory neurons and primary parietal cortex, and motor neurons and primary frontal cortex. The thumb has a disproportionately large area of cortical tissue devoted to its sensation and movement, more than two fingers combined and much more than the sensory/motor parts to move the arm. I believe this contributes to greater precision, faster response, and less fatigue.
Many people have never used a trackball and the market shows they're not in great demand. This is okay with me as long as they keep making a few, but I fear they may go the way of the dinosaur (for vastly different reasons of course).
So are there any other die-hard trackball users out there? Enough of us to warrant a production line? I can't think of any reason to use a mouse, am I missing something? Many years ago, I thought the trackball would eradicate the mice, simply due to it's superiority, but this is obviously not the case. Any ideas on why mice are still the pointer of choice?
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