Jean Dubuffet (1901 - 1985) drew inspiration from the work of untrained artists who were often excluded from society and tapped into own primal energies in making his work. (jacktworkov.com)
On the contrary, ever since Jean Dubuffet established his collection of Art Brut in the 1940s and, later, Roger Cardinal coined the more inclusive category of Outsider Art in 1972, there has been a thriving market for — and discourse around — work by untrained artists which has existed more or less separately from the parallel milieu of contemporary, academic art. (frieze.com)
Instead, he channeled the raw emotional spontaneity of untrained artists, children, and the mentally disabled. (skinnerinc.com)