Argumentation Mar 2026 Open Access

Experimental Insights into the Influence of Logic and Pragmatics on Conditional Argument Evaluation

Ermioni Seremeta Panteion University ; Monique Flecken University of Amsterdam ; Menno Reijven University of Amsterdam ; Jean Wagemans University of Amsterdam

Abstract

Research on conditional reasoning has long debated whether human rationality is best captured by logicist accounts or by pragmatically oriented approaches such as Relevance Theory, which highlight contextual and communicative factors. While the former predict reliable adherence to logical schemata (e.g., Modus Ponens and Modus Tollens), experimental evidence consistently reveals systematic deviations, such as endorsement of invalid inferences. The latter view attributes such patterns not to irrationality, but to pragmatic expectations that guide interpretation. This study contributes to this debate by examining how logical validity and pragmatic congruency jointly shape the evaluation of conditional arguments. We report two experiments employing a 2 × 2 factorial design. In Experiment 1, participants evaluated conditional syllogisms framed in the standard 'if/then' format. Results showed that pragmatic violations slowed responses and, crucially, facilitated detection of logical invalidity, without hindering performance on valid arguments. Experiment 2 reformulated the same arguments using the Periodic Table of Arguments to replace 'if/then' conditionals with lever-based structures. Here, participants exhibited a generalized tendency to resist conditional inference, resulting in improved rejection of invalid arguments but reduced recognition of valid ones. Across both studies, pragmatic congruency alone did not predict accuracy, but interactions between pragmatic expectations and logical form systematically influenced evaluations. Taken together, the findings suggest that pragmatics does not override logic but modulates its accessibility: violations of pragmatic expectations invite deliberation. At the same time, semantic scaffolding, such as explicit 'if/then' cues, supports deductive reasoning. We propose that natural argumentation depends on this interplay, highlighting the need for situated accounts of logos.

Journal
Argumentation
Published
2026-03-01
DOI
10.1007/s10503-026-09691-6
CompPile
Open Access
OA PDF Hybrid
Topics
discourse analysis argument assessment
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