Schools against the centrality of vedism: carvaka:
The schools against vedism or its primordial renounciation theories are as parallel to the development of upanisads As the upanisads were compiled there were appoints against them were also raised This is an example for the liberal outlook of hindu philosophy since its arrival into the southasian picture It was speculated initially that these schools that antagonize vedism were from the other tribes living in indo-gangetic plains. But more recent theories feel that it may not be so. Thus the early materialistic schools which give importance to natural evolution, experiential knowledge, wordly pleasures, physical matters, refuses god, disapproves rituals, and inferences Anumana is invalid and anubava is valid; this is an early form of emoirical knowledge and logic. It is also possible it is an early form of behaviourism These schools later came to be know n as nastica)atheist) thoughts They are often associated with Jainism and Buddhism( though there are several differences ) Materialism and upanisads were rival schools but are taken as ends of a spectrum in hindu philosophy It is not correct to say carvaka belongs to the aborigines (pre-aryans)of india alone Early vedic thought like rigveda were purely ritualistic but later ones like atharvan veda have several magico-religious tendencies. Here the priestly power is often more pronounced. It is possible carvaka belong to the same period, when there is a antagonism to this practice.