I think there are many healers who work without rattling beads.  I think you also have to understand that many healers aren't necessarily scientists or even particularly rational.**  They often believe themselves in the ju-ju.

Also, note that I didn't limit my view of healing to 'positive psychological conditioning'.  As I said earlier, I believe that there's more happening here.

**Interestingly though, the president of the Association of Dowsers (or whatever they were called) was Arthur Bailey who was also the inventor of the modern transmission line method of bass loading.