Psychologist J. Philippe Rushton accused Gould of "scholarly malfeasance" for misrepresenting and for ignoring contemporary scientific research pertinent to the subject of his book, and for attacking dead hypotheses and methods of research. He faulted "The Mismeasure of Man" because it did not mention the magnetic resonance imaging (MRI) studies that showed the existence of statistical correlations among brain-size, IQ, and the "g" factor, despite Rushton having sent copies of the MRI studies to Gould. Rushton further criticized the book for the absence of the results of five studies of twins reared apart corroborating the findings of Cyril Burt—the contemporary average was 0.75 compared to the average of 0.77 reported by Burt.