Thanks for the youtube link.
I saw.
Indeed, only the intention is enough and it is necessary, so when one does not believe it, difficult to have the intention.
We must not stop at this only. A paraplegic may have the intention of ... walking, but he can not do that unless obviously apparatus. In this field of non touching, not "verifiable" (by instruments precisely), this obviously benefits the doubt. This is why it works even more for those who do not believe! Which, in their eyes, will show that it is not a placebo or a pass pass "metaphysical". The disadvantage is that those who challenge the most, are also those who do not want to try (like for engines "water", or homeopathy in terms of care and health.)