I believe that this may be Mr. Christ's first book, and I am sorry, but I must say that it shows. The author near the beginning of "Thinking About Thinking" dismisses completely the idea of "reductionism" but since the mapping of the human genome was completed roughly twenty years ago, biological determinism has once again stormed into the forefront of the scientific study of complex human behavioral traits as clearly demonstrated by the findings of Polderman et.al., (2015). As their Abstract states: "We report a meta-analysis of twin correlations and reported variance components for 17,804 traits from 2,748 publications including 14,558,903 partly dependent twin pairs, virtually all published twin studies of complex traits." And " For a majority (69%) of traits, the observed twin correlations are consistent with a simple and parsimonious model where twin resemblance is solely due to additive genetic variation. The data are inconsistent with substantial influences from shared environment or non-additive genetic variation." In short, shared environments play almost no role in connection with the source of complex human behavioral traits, and non-shared environments which are idiosyncratic and random provide no path for amelioration. Thus, we now have the explanation for the utter failure of every attempt to close racial gaps over the past 70 years.
Btw, I increased my rating of this book by one star for its excellent defense of free speech, especially in our nation's academies.