A book review published in "Phenomenology and the Cognitive Sciences" characterized "The Essential Difference" as "very disappointing" with a "superficial notion of intelligence", concluding that Baron-Cohen's major claims about mind-blindness and systemizing–empathizing are "at best, dubious". According to "Time" magazine, his views on systemising traits had "earned him the ire of some parents of autistic children, who complain that he underestimates their families' suffering". "Time" said that while research from Washington University in St. Louis did not support the assortative mating theory, a survey finding that autism was twice as high in Eindhoven (the Silicon Valley of the Netherlands) had "breathed new life" into Baron-Cohen's theory. "Time" magazine has also criticized the assortative mating theory proposed by Baron-Cohen, claiming that it is largely speculative and based on anecdotal evidence. The theory claims that autism rates are increasing because "systemizers", individuals with more autistic traits, are more likely to marry each other and are more likely to have autistic offspring due to relatively recent societal changes. James McGrath has criticized the autism-spectrum quotient, writing that the score increases if one indicates interest in mathematics, and decreases if one indicates interest in literature or art. He claims that this leads to the false notion that most autistic people are strong in math.