Purpose of Helmholtz 2 point sensation range

[blesswin...@gmail.com]

Hi,

I have a question about what is happening in this video at 00:28:17 -

http://www.youtube.com/watch?v=7n3B5lYcbN8#t=1697s.

Helmholtz Founded the 2 point sensation range differs from person to person,but what we can able to know or get benefited from this mam.

Thanks!

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