The observed relationship between Sahaja Yoga meditation (SYM) practices and mental health are not similarly as strong for measures of physical health. In many ways this might be expected since the intervention is primarily focused on a mental experience with the specific aim of reducing negative affect, thinking patterns and related behaviours. Mood, thoughts and behaviour patterns are in constant flux, much of it reflecting (and influencing) brain electrical activity and other neuro-behavioural phenomena which change from moment to moment. Aftanas (2001) has shown that the practice of SYM, and the experience of meditation, is strongly reflected in both brain electrophysiology and mood. This might explain why mental health factors are much more likely to be immediately responsive to such an intervention whereas physical health factors, which rely significantly on anatomical structures and mechanical function, will take much longer to manifest (if at all) and are subject to a vast number of other environmental confounders that may obscure any such relationship.