William Seager (2016) and Hedda Hassel Mørch (2014, 2018) have independently defended a non-layered form of panpsychist emergentism, which we can call “fusionism”. According to fusionism, when micro-level subjects come together to form a human mind they don’t compose it as bricks compose a house, rather they as it were fuse into it, ceasing to exist in the process. On Seager’s view the post-fusion conscious brain entirely lacks parts; it is a “big simple”. On Mørch’s view the post-fusion conscious brain still has parts, but whereas pre-fusion the brain was dependent for its existence on its parts, post-fusion the parts are dependent for their existence upon the brain. Mørch develops her view as a form of the integrated information theory of consciousness, a leading neuroscientific theory of consciousness which arguably has panpsychist implications (for more on the integrated information theory of consciousness, see the entry on the neuroscience of consciousness).