the human brain has grown and built upon earlier, more primitive brain structures, the "ghost in the machine", which at times overpower higher logical functions, and are responsible for hate, anger and other such destructive impulses. Shirow denies dualism similarly in his work, but defines the "ghost" more broadly, not only as a physical trait, but as a phase or phenomenon that appears in a system at a certain level of complexity. The brain itself is only part of the whole neural network; if, for example, an organ is removed from a body, the autonomic nerve of the organ and consequently its "ghost" will vanish unless the stimulus of the existence of the organ is perfectly re-produced by a mechanical substitution. This can be compared, by analogy, to a person born with innate deafness being unable to understand the concept of "hearing" unless taught.