The Evolution
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First principle: In any consistently or unexpectedly easy inter-
section of two concepts, there must be at least one set of part-whole
links involved (i.e. a Type I or Type II intersection is at work).
ISecond principle: Type II intersections are more easily carried
out with the whole-to-whole links first and the part-whole links second.
Third principle: If memory is consistently unsuccessful or experi-
ences unexpected difficulties in yielding an intersected concept, there
must be two sets of whole-to-whole links (i.e. a Type III situation)
involved.
Of these three principles the least serviceable is the third, as
it involves a search for consistent failure to yield an intersected
concept.
Fortunately for the experimenter the first and second principles
work very well together. Thus for anyone wanting to know what part-whole
links (if any) emanate from a concept such as "deception," the first
principle suggests the idea that a concept such as "hospital," which has
many whole-to-whole links, should be made to precede (this is required
by the second principle) the concept "deception," in a presentation to
a subject who is then to attempt to intersect them. If the subject
reports that hospital deception yields, say, "placebo," then the first
principle would indicate that "deception" must have operated by a
part-whole link.