> One study of "toy preferences" in vervet monkeys was ambiguous, since the boy vervets seemed most interested in the plush dog (a toy deemed "neutral") and the girl vervets paid relatively little attention to the doll. The girl vervets did prefer playing with the toy cooking pot, but exactly what they did with it was not reported.
This is the study that the picture at the top of the article is from -- however, the monkey study by Wallen referenced in the article appears to be this one http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583786/
> One study of "toy preferences" in vervet monkeys was ambiguous, since the boy vervets seemed most interested in the plush dog (a toy deemed "neutral") and the girl vervets paid relatively little attention to the doll. The girl vervets did prefer playing with the toy cooking pot, but exactly what they did with it was not reported.
Graph of the data that passage is describing:
http://i.imgur.com/t4R8hH4.png
from http://academic.evergreen.edu/curricular/imagingthebody/Hand...
This is the study that the picture at the top of the article is from -- however, the monkey study by Wallen referenced in the article appears to be this one http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583786/