I'll have to find the plank experiment one. That sounds interesting.
It was about four years ago, from memory.
I'd say the violin experiment is more about acoustical properties. A pickup is turning your vibrating string into an electrical signal. An acoustic instrument actually uses the wood to amplify the sound. I was mainly talking about electric solid body guitars.
The violin test was about modern or old violins are better. Received wisdom is that old ones are better. The test demonstrated no such effect (if anything player preference was for new, but not statistically significantly so, so essentially a dead heat). So it was more an example of the fact that received wisdom may or may not be accurate, and the valid test is having a valid test.