 Empirical studies on Aristotle’s theses have been carried out by Pfeifer (2012), Pfeifer and Tulkki (2017), and Pfeifer and Yama (2017). In one experiment, presented in Pfeifer 2012, the sample consisted of 141 psychology students (110 females and 31 males) at the University of Salzburg, Austria. Both AT and AT′ were tested as abstract as well as concrete indicative conditionals. In a second experiment, 40 students without training in logic (20 females and 20 males) had to solve tasks involving concrete indicative conditionals in English. In this case, scope ambiguities arising from the negation of conditionals were ruled out. Both experiments provide evidence against the interpretation of indicative conditionals in English as Boolean implication and support the connexive reading of negated implications expressed by Aristotle’s theses. Pfeifer sees these findings as strong evidence for interpreting indicative conditionals as conditional events. This interpretation predicts that people should strongly believe that Aristotle’s theses are valid because the only coherent assessment for them is the probability value 1.