Changes in blood flow pattern, such as from plaque build - up in the arteries, initiate a cascade of conflicting signals. (sciencedaily.com)
Always brush from the feet up, moving left to right in motion (following natural blood flow patterns), and swipe up towards the heart. (fitbodyhq.com)
Lamm and his group recently sought the answer to answer this question by combining measures of electrical activity in the brain (via electroencephalogram) with functional magnetic resonance imaging to show blood flow patterns in 25 participants getting rounds of shocks on their hands. (sciencenews.org)