Mr Randi is doing what he does best, staging for an audience.
He is a showman, and a magician, not a scientist. His prize is simply publicity for himself and his professional actvities, IMHO.
Ah hah. So much for your "no axe to grind"
.
Well, OK, he is testing a given dowser's claims, that, I have to concede, but he is not testing the phenomena of dowsing, that is something quite different.
He is not CLAIMING to test anything but individual dowsers. If he was claiming that the tests disproved dowsing per se, then he could stop testing dowsers, and simply reject any new dowsing claims. But he keeps testing dowsers.
Placabos are utilised, usually for scientific medical research, as a control so that any effects of the observed outcome caused by internalised origins within the brain, positively or negatively, can be eliminated.
Yeah, I know.
In Randi's tests this effect is not taken into account. Now why is this important? Simply because we do not really understand the origins and causes of the effect in a pioneering test scenario.
The dowser claims to be ably to do something that has a neffect in the real world. At JREF challenge level, nobody gives a d*mn HOW he does it. All he needs to do is show the real effect in the real world.
It could be totally internalised(imagined)
And so far, it has been just that
.
or it could be an interaction by some external force with human body as a receiver. If it is the former, as with say a sportsperson, the internalised effect on performance, can be distorted qualitively, by the magnitude of the occasion, i.e. nervous
debilitation.
I suppose so, however, dowsers (at least some) dowse for money. Would you care to explain how a dowser can easily avoid "nervous debilitation" when being watched by a paying customer, but it kicks in as soon as somebody says "James Randi"??