In the Yoga Sutras of Patanjali, the mind is described as experiencing five types of mental modifications or vrittis: Pramana, Viparyaya, Vikalpa, Nidra, Smrtayah. Understanding these helps in attaining clarity and control over the mind.Pramana refers to correct knowledge gained through perception, inference, and reliable testimony. Viparyaya is incorrect knowledge or illusion, where ... https://www.yogkulam.org/blog/yoga-sutra-1-6-pramana-viparyaya-vikalpa-nidra-smrtayah