As Dick Veit points out, a pause is possible in the nonrestrictive 
reading. There is also a difference in voice pitch: the restrictive 
appositive will have a higher pitch on it, to achieve the contrastive 
effect, while a non-restrictive will either stay close to the pitch of 
the rest of the phrase or will actually drop.

My sister Judy (restr.) is relatively flat over 'sister' with a rise on 
"Ju-"

My sister, Judy, (non-r.) Pitch on "sis" and "Ju" about the same.

The are other ways to intone these depending on the context, but these 
are the defaults.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Johanna Rubba   Associate Professor, Linguistics
English Department, California Polytechnic State University
One Grand Avenue  • San Luis Obispo, CA 93407
Tel. (805)-756-2184  •  Fax: (805)-756-6374 • Dept. Phone.  756-2596
• E-mail: [log in to unmask] •      Home page: 
http://www.cla.calpoly.edu/~jrubba
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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