Why Did Eysenck Move Impulsivity?
Han S. Paik Washington University Jang has written a good review of Eysenck’s PEN model and Gray’s reformulation of that model. Both the descriptive and causal aspects of Eysenck’s PEN model are adequately described. Each of the different levels of the hierarchy, in the taxonomic portion of the model, is drawn out well, and each of the biological causes for the three different dimensions is also explained carefully. Also, Gray’s reformulation of the model is treated with sufficient representation. Overall, Jang has done a good job of covering the many different aspects involved with the PEN model and has explained them thoroughly. However, I hope to help in the clarification of some of the finer details of the model. Jang states that, “Although the overall evidence supports the PEN model quite well, there are also many anomalies to be cleared up.” He mentions that the trait of impulsivity was originally under the superfactor of extraversion but was later moved to psychoticism. Furtherm
