Our society may have changed so much since the times when our natures were formed that even if a person lacks certain abilities, for example, to be a hunter, and was evolutionarily speaking unnatural, we could agree that the ability to be a hunter is no longer necessary in our society, and so lacking hunter abilities does not mean one has a disorder. Further, some deficits may make us less than perfect, but still we would not judge that we are so lacking as to have a disorder.
This leads Wakefield to the following analysis of a disorder:
A condition is a disorder if and only if (a) the condition causes some harm or deprivation of benefit to the person as judged by the standards of the person's culture (the value criterion), and (b) the condition results from the inability of some internal mechanism to perform its natural function, wherein a natural function is an effect that is part of the evolutionary explanation of the existence and structure of the mechanism (the explanatory criterion). (Wakefield, 1992, in Edwards, 1997, pp. 87–8)
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