If you give a person a piece of candy and they smile and salivate

If you give a person a piece of candy and they smile and salivate

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If you give a person a piece of candy and they smile and salivate, what is  the cause of the smile and salivation? At first glance, it is certainly the  stimulus of being given the candy; but, further thought adds the  realization that the person learned over the course of a few experiences  that those things that are wrapped in the bright blue wrapper are sour  and taste good. Further, you would accept that it was necessary for the  person to develop a preference for extremely sour candy over the years.  Finally, it is obvious that animals developed the tendency to salivate to  acids millions of years ago over the course of many many generations.  The interdependence of these areas is obvious, but it is often overlooked.  The fact that a functional relationship can be confounded comes as no  surprise to anyone. However, functional relationships are often not 
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