The Brain in Indian Medical and Religious Traditions: A Relational Organ Model of Mastiṣka, Hṛdaya, and Nāḍī

This article examines the concept of the brain (mastiṣka) within the Indian intellectual tradition, tracing its development from the magico-religious medicine of the Atharvaveda (c. 1200–900 BCE) through the classical Āyurvedic texts—the Suśrutasaṃhitā, the Caraksaṃhitā, the Aṣṭāṅgahṛdayasaṃhitā, and the relatively neglected Bhelasaṃhitā—to the subtle-body physiology of Haṭha Yoga literature. Against the background of a comparative analysis with the brain–heart debate in ancient Greek medicine, the article argues that Indian medicine developed a distinctive ‘relational organ model’ in which brain and heart constitute complementary poles of a single vital-cognitive network mediated by the nāḍī (neural-energetic channel) system. This model is neither simply cardiocentric nor encephalocentrist but integrates both within a hierarchical framework. The Bhelasaṃhitā’s unique near-encephalocentrist statement (śiras tālvantare cetanādhiṣṭhānam) reveals a genuine internal debate within classical Indian medicine, while the Haṭhayogic synthesis—locating the ultimate seat of consciousness in the cranial Sahasrāra while preserving the heart as the integrative hub of all channels—represents a coherent integration of both tendencies. The Sāṃkhya philosophical framework provides the metaphysical key to this integration, distinguishing non-material consciousness (puruṣa) from the material cognitive apparatus (antaḥkaraṇa). The article brings into dialogue these historical findings with recent research in neurocardiology, neuroimaging, and prāṇāyāma science to illuminate areas of empirical convergence, contributing to the interdisciplinary dialogue among science, religion, and health on the nature of human flourishing.