Deductive vs Inductive Reasoning

Deductive reasoning derives specific conclusions from general premises; inductive reasoning infers general patterns from specific cases.

Why distinguish deduction from induction?

Deductive conclusions are guaranteed if premises hold; inductive ones are only probable.

• Deductive: general to specific, conclusion must follow if premises are true
• Inductive: specific to general, conclusion is probable

Conditional reasoning is a deductive subtype: reasoning about “if P then Q”. Categorical syllogisms are the classic formal version: two premises, one conclusion.

Content effects

People reason much better when problems have familiar, socially meaningful content. The same logical structure can feel obvious or baffling depending on what it’s about, which is why cheating-detection framings make Wason selection tasks feel easy.

Theories:

• Rules-based: we apply abstract logical rules
• Mental models: we build concrete mental models and check them