This is a good read on Chakras from  While the author doesn't go beyond Sanskrit texts, the back and forth between China and India between the 6th and 10th Centuries was vigorous.  Thus, it is not surprising that these ideas about a visualized and somaticized inner body transcending time and space would show up and develop at that time in both places with a huge variety of characteristics.  I might also point out that the so-called "emotions" he refers too could also be thought of as theatrical expressions of mood in the South Asian context.  That is, solo ritual expressions of mood were, like deity visualizations, connected to theater and dance as pervasive cultural narrative.   This post is just a teaser for my next big post on Monday...Oprah and Synesthesia.