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Most theories of reasoning assume that human reasoning ability is stable over time, but few studies have investigated the matter. We analyzed a study in which 20 participants drew their own conclusions to the 64 sorts of syllogisms on two occasions separated by roughly a week.
Christina Quelhas and Phil Johnson-Laird published a recent paper in QJEP on how disjunctive assertions are modulated by the contents of their clauses. You can read the paper here, and the abstract is below.