Touché26-Fallacy-Detection

Dataset for the Fallacy Detection task at Touché 2026, based on the informal fallacies dataset by Sahai et al. (2021). Data Fields Each JSON entry contains the following fields: Source Text Field Description id Unique identifier for the entry. text_raw The original Reddit comment. text_raw_parent The parent comment of text_raw. text_raw_title Title of the thread text_raw originates from. Processed Arguments Field Description text_base Self-contained rewrite of text_raw that incorporates relevant context from text_raw_parent and text_raw_title. argument_base {claim, supports} — the argument structure extracted from text_base. text_enhanced Rewrite of text_base that explicitly surfaces fallacy and scheme information. argument_enhanced {claim, supports} — the argument structure extracted from text_enhanced. Labels Field Description fallacy_exists Binary label (0 / 1) indicating whether the entry contains a fallacy. fallacy_type The specific type of fallacy (e.g., authority, slippery_slope, hasty_generalization). resembles_fallacy The fallacy type this argument most closely resembles. Equals fallacy_type for fallacious entries. For non-fallacious entries, identifies which fallacy the reasoning pattern could plausibly be confused with. classification {argument_goal, argument_basis} — argumentation scheme dimensions based on Macagno (2022). Base vs. Enhanced Fields Reddit arguments are often unclear and rely on implicit assumptions. The dataset therefore provides two levels of processing: Base fields (text_base, argument_base) produce a self-contained version of the argument by integrating context from the parent comment and thread title. Enhanced fields (text_enhanced, argument_enhanced) are additionally rewritten with knowledge of the corresponding fallacy and scheme labels, making the reasoning patterns more explicit. Resembles Fallacy Each non-fallacious entry was deliberately selected because its reasoning pattern resembles a specific fallacy type. For example, an entry with resembles_fallacy: authority contains a legitimate appeal to authority — structurally similar to a fallacious one, but without committing the fallacy.