Like Dirgha-svasa-preksa, samavrtti svasa-preksa is also an important process of this meditational system. Here breath is exhaled through one (say, left) nostril and inhaled through the other (right). Then exhaling through the right, it is inhaled through the left. Throughout the process, the perceptive mind is closely linked with the breath.
As in dirgha svasa-preksa, breath is regulated to be rhythmic. In due course, by the practice of this, one can develop the inherent capacities of the subconscious mind such as extra-sensory perception, clairvoyance etc.