The conditional in the new paradigm

The conditional in the new paradigm

by Jean Baratgin, Maxime Bourlier

Humanities, Social Sciences & Thought Philosophy & Ethics QDTTopics in philosophyQDTLPhilosophy: logic
🎙 Jean Baratgin, Maxime Bourlier 👥 2K 📅 July 9, 2026 ⏱ 57 min 👁 6 📄 expert opinion 🧭 2026-08-15
Available in: English (current) Français

Keywords

conditionalnew paradigmprobabilityde Finettireasoning

Summary

This presentation, part of a summer school at UQAM, introduces the ’new paradigm’ in the psychology of reasoning, which replaces classical binary logic with a probabilistic framework. The speakers, Jean Baratgin and Maxime Bourlier, begin by contrasting the classical material conditional with the ‘defective truth table’ observed in experiments, where participants reject the vacuous truth of conditionals with false antecedents. They then present de Finetti’s trivalent semantics, which introduces a third ‘void’ value for uncertain cases, and show how this aligns with participants’ judgments. The talk moves to the probability of conditionals, presenting the key finding that people tend to interpret the probability of ‘if A then C’ as the conditional probability P(C|A), rather than the probability of the material conditional. They discuss experiments using chips to illustrate this, and address the question of whether this interpretation is intuitive or cognitively demanding. Using dual-process theory, they present evidence from their own research (including eye-tracking and cognitive load manipulations) suggesting that the conditional probability interpretation is indeed intuitive. Finally, they address challenges to de Finetti’s semantics, such as ‘missing link’ conditionals and relevance effects, and propose answers based on their work.

190 words

Critical Evaluation

Value of the Information & Strength of the Argument

The presentation offers a valuable overview of the new paradigm in reasoning research, synthesizing key theoretical and empirical work. The argumentation is solid, building from classical logic to de Finetti’s semantics and then to probabilistic interpretations, with clear explanations of experimental paradigms. The speakers effectively use examples (e.g., chips) to illustrate abstract concepts. They also present their own research, which adds originality. However, the talk is largely a review of existing literature, and the novel contributions (e.g., their experiments on intuitiveness) are described briefly without full methodological details.

Scientific Rigor, Source Quality, Title Accuracy

The presentation demonstrates scientific rigor by grounding claims in established literature (e.g., Wason, de Finetti, Pfeifer & Kleiter). The sources are mentioned verbally, but no explicit citations or references are provided in the video description. The title accurately reflects the content. The talk is a lecture, so it is not peer-reviewed, but it is presented by experts in the field. The adequacy between title and content is high.

171 words

Title / Content Match

The title accurately reflects the content, which focuses on the conditional in the new paradigm of reasoning.

Quality & Reliability

7/10

Presentation of ongoing PhD research by experts in cognitive psychology, with references to established literature (e.g., Wason, de Finetti, Pfeifer & Kleiter). However, the talk is a lecture without peer review, and some claims are presented without detailed evidence.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

  • Wason's selection task — Mentioned as the experiment that showed people do not follow classical logic.
  • de Finetti's semantics — Introduced as the basis for the trivalent logic of conditionals.
  • Pfeifer & Kleiter (2010) — Cited for the priority judgment task and the conditional probability interpretation.

Concurring Sources

  • Pfeifer & Kleiter (2010) — Their findings support the conditional probability interpretation.
  • Evans & Over (2004) — Their work on the new paradigm and conditionals aligns with the presentation.

Dissenting Sources

  • Classical logic approach — The classical material conditional interpretation is contrasted with the new paradigm.

Contribution & Novelties

The presentation synthesizes the new paradigm in reasoning research, emphasizing de Finetti’s trivalent semantics and the probabilistic interpretation of conditionals. It contributes by presenting original research on the intuitiveness of the conditional probability interpretation, using cognitive load and time pressure manipulations. The talk also addresses challenges to de Finetti’s semantics, such as missing link conditionals, and proposes answers.

Pour aller plus loin :

  • New Paradigm Psychology of Reasoning — Overview of the paradigm shift.
  • Conditional probability — Mathematical foundation for the interpretation.
  • Bruno de Finetti — Biographical context for the semantics.

91 words

Radar Profile

The radar profile shows high scores in quantity and quality of information, with moderate technical level and reliability. This indicates a well-structured and informative presentation, though not extremely technical or heavily cited.

Reliability 7/10