“…It has been demonstrated that performance on these forms is determined largely by whether the reasoner has access to potential alternative antecedents that differ from P but result in the same consequent Q, such as the skin disease in our example above that also makes a dog scratch constantly (Markovits, 1984;Rumain, Connell, & Braine, 1983). Thus, studies on conditional reasoning suggest that the availability of knowledge and its retrieval from semantic memory are important components of performance on the uncertain forms (Barrouillet & Lecas, 1998Cummins, 1995;Cummins, Lubart, Alksnis, & Rist, 1991;Markovits, 2000;Markovits & Vachon, 1990). The structure of semantic memory and the constraints on retrieval processes have been integrated in some recent models of human reasoning, a theoretical trend that has recently been referred to as the semantic memory framework (De Neys, Schaeken, & d'Ydewalle, 2002).…”