Real Effects of Random Noise?

Real Effects of Random Noise?

Yet another paper in the pseudo-medical world that I read and think what the?

In this case it is PLOS One in their CAM feed with  Whole Body Vibration Improves Cognition in Healthy Young Adults. It does? Really?

They hypothesise that since exercise improves mental functioning and since some people can't exercise, perhaps vibrating them will have the same effect.

So they sat people in a chair and vibrated them at various frequencies or they just sat in the non-vibrating chair as a control. They tested higher function with

Stroop Color-Block Test (CBT), Stroop Color-Word Interference Test (CWIT), Stroop Difference Score (SDS) and Digit Span Backward task (DSBT) was measured

Only one vibration frequency had effect:

Only the passive WBV condition with 30 Hz frequency and approximately 0.5 mm amplitude improved executive functions (attention and inhibition). This may be explained by the specific sensitivity of Meissner corpuscles in the skin. Meissner corpuscles are especially sensitive to 30–40 Hz vibration

Or does it? Looking at the tables of data the effect is less than impressive, especially when remembering Corollary 3:

The greater the number and the lesser the selection of tested relationships in a scientific field, the less likely the research findings are to be true.

The most 'significant' effect is for the Stroop Color-Word Interference Test: 13.37 +/- 2.09 for the treatment and 13.64 +/- 2.19 for the control with a p of 0.009. Lots of overlap and a small absolute difference .

I see the pseudo-signficance that results form testing multiple associations rather than a real effect. I would call it a negative study, and not conclude that further studies need to be done.

When I go to the State Fair they have lots of vibrating chairs for those with sore feet. They make my nose tickle, but I have never felt more alert as a result. Doubt it ever would.

Points of Interest 7/21/2014
A Scale Would Be Easier