  The Yogācāra school, which is associated with the works of the half-brothers Asaṅga and Vasubandhu, its founders and principal exponents, is often identified by later Buddhist doxographers as the Mind-only or Cognition-only School (Cittamātra or Vijñaptimātra), on account of its internalist  epistemology. In texts such as Vasubandhu's Twenty Verses: A  Demonstration on Existence of Consciousness Only  (Viṃśatikā  Vijñaptimātratāsiddhi; hereafter VVS) and  Dignāga's Investigation of the Cognitive Support  (Ālambanaparīkṣā; and its  Vṛtti; hereafter APV) we are presented with a  metaphysical picture of cognitive awareness or consciousness as the  only ultimately existing reality. 