Some physicists have also been willing to consider an even more direct connection between mind and quantum matter, in a quantum version of panpsychism. In his 1975 book Disturbing the Universe, Freeman Dyson wrote that "mind is already inherent in every electron, and the processes of human consciousness differ only in degree but not in kind from the processes of choice between quantum states". David Bohm 's 1951 book Quantum Theory included a chapter on "Analogies to Quantum Processes" where he considered applications including the understanding of thought processes, and in 1990 he published a paper named "A new theory of the relationship of mind and matter" which asserts that consciousness permeates all forms of matter. These ideas were popularised and extended by Danah Zohar in books including The Quantum Self and (with Ian Marshall) The Quantum Society. Karen Barad 's 2007 book Meeting the Universe Halfway took "Niels Bohr's philosophy-physics" as a starting point to develop her theory of agential realism.