The Nada Anusandhana Dhyana Mantra is a meditative formula used in the practice of Nada Anusandhana, the yogic discipline of focusing on the inner sound (nada) to achieve deep meditative absorption. The term 'nada' refers to subtle sound, and 'anusandhana' means investigation or pursuit. The ultimate goal is the realization of the unstruck sound (anahata nada), which is considered the primordial vibration of the universe and a manifestation of Nada Brahman, the absolute as sound. The textual basis for this practice is found in the Nada Bindu Upanishad (verses 32-52), which describes the stages of hearing inner sounds and the dissolution of the mind through concentration on them. Additionally, the Hatha Yoga Pradipika (Chapter 4, verses 65-102) elaborates on Nada Anusandhana as a means to achieve samadhi, stating that by listening to the inner sound, the mind becomes absorbed and ultimately merges with the supreme reality. The mantra itself may consist of the beej-akshara 'Om' or other syllables that resonate with the inner sound, but the practice is primarily non-verbal, focusing on the subtle auditory experience. The phoneme 'Om' is considered the primal sound (pranava) and is associated with the creation and dissolution of the universe, as per the Mandukya Upanishad. The traditional purpose of this mantra is to quiet the mind, withdraw the senses, and lead the practitioner to the experience of anahata nada, which is said to arise spontaneously from the heart center (anahata chakra) when the mind is still. Benefits include enhanced concentration, inner peace, and ultimately the attainment of samadhi. The recommended chanting context is during seated meditation, preferably in a quiet environment, at dawn or dusk. The practice is often done in conjunction with pranayama and asanas to prepare the body and mind. There is no fixed count, but tradition holds that consistent daily practice over a long period yields results. Cautions include the need for proper guidance from a qualified guru, as the practice can lead to intense experiences that may be destabilizing without proper grounding. It is also advised not to force the hearing of sounds but to remain a passive observer. The mantra is worshiped pan-India and globally, especially in yoga and meditation circles, and is associated with sound meditation retreats.
Nada Anusandhana, the meditation on the inner sound, the unstruck sound.