Dear Jennifer StGeorge

please check the resources related to your topic

regards

www.shutterstock.com/s/parent+and+child/search.html

thank you for your response her Nirmala. The Roggman article is excellent.

Children are innocent & their smiles reflected in their in their behavior & the religion action . Where the question of play for children arises it will be mode outdoor & indoor games & not only that when the children either play with the mother or their brother & sisters at their resi , their smile reflect a special action of behavior .

In case of the indoor games quite often the mother or  brother & sister in order to encourage the participate  in the games . In such cases if the children receive a successful marks & then the question should not arises but in spite of their growing that they are defeating in their game they try to argue with their disturbing face & when the mother explain the correct situation their smile generally appear between nature & little bit partial in angry mood but it certainly represent their smile.

In outdoor game they are with their own groups & friends & that is why their smile is mostly in joyous under a healthy ,laughing mood .

This is my personal opinion 

thank you for these. I am looking for quite specific information on the smile types, duplay, duchenne, etc how these relate to children's level of joy, what contexts they are found in, in order to be able to measure more precisely their affect etc within play.