Most of the references I find are in connection with a brain lesion malfunction which renders the subject unable to use language. It's called "aphasia."
http://www.answers.com/topic/aphasia
"Verbing" is a function which is lost. Therapy can lead to a gradual recovery in some cases.
I didn't have much luck getting a URL. I got a contents page for a collection of studies.
http://docs.google.com/gview?a=v&q=cache:Yrtat-qgBzkJ:aphasiology.pitt.edu/archive/00001326/02/09-contents.pdf+%22verbing%22+speech+therapy&hl=en&gl=us&sig=AFQjCNFf5t-Dho34eKZK_RJnbBeU0IHLrQ
One listed article was "Applications of Verbing Strategies to Aphasia Treatment
- F.L. Loverso, M. Selinger, T.E. Prescott