Placebo effect 'starts in the spine'

[Blue Wode]

Could this go some way towards explaining why chiropractors are convinced that their spinal manipulations have a specific effect?
http://www.nhs.uk/news/2009/10October/Pages/Placebo-effect-starts-in-the-spine.aspx

 

[Dancing David]

Sample size 15, reported effect 25%

Dubious.