Dear Carol,
Snowy but cheerful greetings, and...
Thank you for a most interesting post. it well may be! Since the natural facial expression during 'unnatural' events is not always a pretty picture, maybe people with pain have a real challenge here, but let's s give it a try!
Warm regards, LDMF.
Dr. Linda D. Misek-Falkoff
Co-Founder with Carol Levy: Persons With Pain Intl.
Other Affiliations on Request.