  The epistemologists who follow Dignāga's account of  perception thus agree that cognitive awareness is a self-revealing  type of cognition. As such it accompanies (by virtue of arising  together with) each perceptual event. And perception, specifically  any type of perception lacking conceptual elaboration  (kalpanāpoḍha), is associated with knowledge of  particulars. It is precisely this aspect of Dignāga's theory of  perception that is an object of criticism by Mādhyamika  philosophers like Candrakīrti (see  Madhyamākavatāra VI, 72–78), even if only  indirectly: Candrakīrti's arguments target primarily the  Yogācāra doctrine of three natures. As explained in works  such as Vasubandhu's Trisvabhāvanirdeśa and  Madhyāntavibhāgabhāṣya, the three  natures or forms of existence are: