Editing Illusory correlation (section)

===Paradigm structure===
Berndsen et al. (1999) wanted to determine if the structure of testing for illusory correlations could lead to the formation of illusory correlations.  The hypothesis was that identifying test variables as Group A and Group B might be causing the participants to look for differences between the groups, resulting in the creation of illusory correlations.  An experiment was set up where one set of participants were told the groups were Group A and Group B, while another set of participants were given groups labeled as students who graduated in 1993 or 1994.  This study found that illusory correlations were more likely to be created when the groups were Group A and B, as compared to students of the class of 1993 or the class of 1994.<ref name="Berndsen 2">{{cite journal|last1=Berndsen|first1=Mariëtte|last2=Spears|first2=Russell|last3=Pligt|first3=Joop|last4=McGarty|first4=Craig|title=Determinants of intergroup differentiation in the illusory correlation task|journal=British Journal of Psychology|volume=90|issue=2|year=1999|pages=201–220|doi=10.1348/000712699161350}}</ref>