Sentence:  Tiller observes that pendulums, dowsing rods and <WSD>radionics</WSD> devices all serve to reduce the signal/noise ratio. They help the average individual who is not blessed with the gifts of concentration that are apparently inherent in gifted healers ... 
Meaning of the word marked with <WSD> tags:  Any of several techniques supposed to detect and modulate "life forces" and to provide healing using various electric black boxes. (from 20th c.)