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Perhaps if we are going to discuss this on a scientific level...

November 20 2006 at 2:06 PM

michael.ting  (Login mkt32)
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Response to LOL! Pull up your pants folks, because it's too late to save the shoes

then we'll need to distinguish between different "types of touching".

Active touch is when a subject's finger moves over sa tationary surface which I believe is the motion that is being described.

The limit of discrimination with touch is about 0.8mm.

The limit of discrimination with active touch is about 20-40 microns (0.02 to 0.04 millimeters) (75% correct performance level)

The superior discrimination of active touch is thought to be due to more vigorous activation of mechanoreceptor populations and/or an ability to use neural code based on both temporal and spatial aspects of the mechanoreceptor response made possible by the relative tangential movements of the finger.

I don't know if 20-40 micron touch discrimination is enough to distinguish between different levels of finish but this limit is perhaps a better representation of the movement described.


Best, Mike


 
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