If you are searching for experimental research which identifies art
activities as beneficial in learning, look at the study by Blaine H.
Moore, & Helen Caldwell, documented in _Journal of Educational
Research_ NOV/DEC 1993 Vol. 87, no. 2, pp. 100-110.and in _Studies in
Art Education_ 1991, Vol. 32, no. 4, pp.207-219. I found both
articals to be well documented and the research descriptions detailed.