def./
"the human brain has grown, it has built upon earlier, more primitive brain structures, and that these are the 'ghost in the machine'.
at times these structures can overpower higher logical functions, and are responsible for hate, anger and other such destructive impulses.
humanity's atavistic brain areas will lead it to self-destruction. however, the same areas responsible for hate and anger are also responsible for certain other emotions, such as love and happiness, which tend to be viewed more positively, although they can in themselves foster or lead to certain destructive urges on an individual level.
certain narcotics, for example, create what may be viewed as 'positive emotions, despite their harmful long term effects."
