Helmuth Nyborg

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Helmuth Nyborg (1937–) is a professor of developmental psychology at Aarhus University, Denmark. He is one of the most cited Danish psychologists. ^[1]His main research topic is the connection between hormones and intelligence. Among other things, he has worked on increasing the intelligence of girls with Turner's syndrome by giving them estrogen.

Nyborg is a controversial figure in the Danish public for his defence of scientific theories such as the inheritance of intelligence and relationship between sex and intelligence. His article in Personality and Individual Differences, in which he reports a 5-point average IQ difference in favour of men ^[2], has led to strong reactions in the Danish public and academia, for example in an editorial by the Danish newspaper Politiken ^[3].

[edit] Aarhus University reaction

Even though the paper had passed peer review in an expert scientific journal, Aarhus University assembled a committee to investigate accusations of scientific malfeasance and fraud, consisting of educational scientist Jan-Eric Gustafsson (Gothenburg), statistician Jens Ledet Jensen (Aarhus), and biostatistician Niels Keiding (Copenhagen). The report concluded that the work exhibits some lack of diligence from Nyborg's side, and that there were errors in Nyborg's work, but that the single, indisputable technical mistake does not allow any conclusions. The committee found no evidence of fraud. The report explicitly does not enter into a discussion of the correctness of Nyborg's research or the methodology of using the general intelligence factor ^[4] Svend Hylleberg, the dean of the social science faculty of Aarhus University, reacted to the report by asking Nyborg to vacate his position in 2006.

Hylleberg's decision has led to strong reactions from international researchers, writing to the faculty dean to protest against what they feel is a witch-hunt.^[5] Among the defenders of Nyborg's work are controversial intelligence researchers J. Philippe Rushton and Linda Gottfredson who themselves have been at the centre of media attention. However, experts from other fields have rallied to Nyborg's side. According to Fred M. Feinberg (University of Michigan), who works in econometrics and has followed Nyborg's work, the level of statistical rigour in Nyborg's research is well ahead of most in the field. He adds that he would be surprised if an investigation into the life's work of equally productive researchers would fail to find mistakes similar to or more serious than the inaccuracies in Nyborg's work, and that Nyborg's mistakes are unintentional, with few substantive consequences for his conclusions. A number of other researchers made broadly similar points, among them many prominent methodologists.

The reported male–female IQ difference in Nyborg's work is ca. 8 points. According to Rushton, his own research points to an IQ difference of 3.63, and the committees' analysis of Nyborg's data would imply a difference 4.55. ^[6]

Further information: Sex and intelligence