Apply the Cosmides-Watson test to yourself again and think why some questions feel easier than others despite having the same logical structure. Try the test with a friend.
Test explained in:
Arruñada, Benito, “Human Nature and Institutional Analysis,” in New Institutional Economics: A Guidebook, Eric Brousseau and Jean-Michel Glachant, eds., pp. 81-99, Cambridge University Press, Cambridge. Available at SSRN: http://ssrn.com/abstract=859084.