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I am struggling with understanding of the following:

It might be shown to produce the same changes in the sound of the voice as saddness.

I do not get why there is "shown to produce", it is like "It might be seen as producing the same changes.."?

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General Reference. Firstly because if something might be seen to be X, you could see it that way without needing to be explicitly shown how that correspondence could be perceived. Secondly because many people would be leery of metaphorically using "to see" in a context where they're talking about changes in the sound. – FumbleFingers Nov 7 '12 at 17:33

closed as general reference by FumbleFingers, MετάEd, Will Hunting, Robusto, tchrist Nov 7 '12 at 19:28

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