21.   Then there is the supposed role of ketchup in human psychology, a theory that probably gets more attention at Heinz than it does in any formal academic quarters.

22.   This is because advertising has come to cover the whole range of human needs and also because it combines real imagination with a deep study of human psychology.

23.   To pretend that this issue is simply one of a choice between good and evil is to know nothing of human psychology.

24.   We go through all the typical, horrible stuff to which human nature and human psychology are prone.

25.   Yet the film allows for the sincerity of both characters, a position that relies more on the oddities of human psychology than on logic.

26.   Human psychology reveals that people are more forgiving than most inexperienced negotiators would give them credit for.

27.   It is a tough tactic for real politics, based on acute observation of how human psychology actually works.

28.   The extra-terrestrial is reduced to human psychology.