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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)

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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