Moving from models to mechanisms in yoga research

Acupuncture system deals with flow of signals in meridians which are not necessarily related to nerves or to blood vessels. In other words, if we observe a specific EEG activity, it may not be possible to conclude that the person is in a specific mental state. [...]even here, the question of correlation or causation cannot be resolved. Since there seems to be a specific biochemical response in the brain to OM chanting, we can use this information for clinical trials in certain CNS disorders.