In 2011 Nyborg published "The Decay of Western Civilization: Double Relaxed Darwinian Selection" in the journal Personality and Individual Differences, arguing that Denmark was likely to experience a dysgenic effect on intelligence due to immigration from the Middle East. Following publication he was indicted by the Danish Committees on Scientific Dishonesty (DCSD), accused of scientific misconduct and of plagiarism by a number of scholars from the University of Aarhus.
Nyborg's 2011 paper argued that Denmark was likely to experience a negative impact on its intelligence levels due to immigration from the Middle East, leading to accusations of scientific misconduct and plagiarism.