# Heuristics Heuristics are mental shortcuts that allow people to make quick decisions and judgments without exhaustive analysis. Studied extensively by [[Daniel Kahneman]] and [[Amos Tversky]], heuristics are the brain's efficient strategies for dealing with complexity and uncertainty. While often useful, they can lead to systematic errors known as [[Cognitive biases]]. Heuristics are a key concept in [[Cognitive Psychology]], [[Behavioral Economics]], and [[Decision Making]] research. The "heuristics and biases" program demonstrated that humans don't process probability and statistics like rational calculators—instead, we use rules of thumb that work well enough in most situations. [[Gerd Gigerenzer]] later argued that heuristics can be "ecologically rational"—optimal for specific environments. Understanding heuristics helps explain both human intelligence (how we cope with complexity) and human error (when shortcuts fail). ## Major Heuristics (Kahneman & Tversky) | Heuristic | Description | Bias It Produces | |-----------|-------------|------------------| | **Availability** | Judge frequency by ease of recall | Overestimate vivid/recent events | | **Representativeness** | Judge probability by similarity | Base rate neglect, conjunction fallacy | | **Anchoring** | Start from initial value, adjust | Insufficient adjustment | | **Affect** | Let emotions guide judgment | Risk perception distortion | ## Availability Heuristic ``` Ease of Recall → Perceived Frequency "What's more common: words starting with 'K' or words with 'K' as 3rd letter?" ┌─────────────────────────────────────────────────────────────┐ │ Words starting with K: King, Kitchen, Kite... │ │ (Easy to recall → seems more common) │ │ │ │ Words with K as 3rd letter: Ask, Acknowledge, Baked... │ │ (Harder to recall → seems less common) │ │ │ │ Reality: 3rd-letter K words are MORE common │ └─────────────────────────────────────────────────────────────┘ ``` ## Representativeness Heuristic ``` The Linda Problem: "Linda is 31, single, outspoken, and very bright. She majored in philosophy. As a student, she was deeply concerned with issues of discrimination and social justice." Which is more probable? A) Linda is a bank teller B) Linda is a bank teller AND active in the feminist movement ┌─────────────────────────────────────────────────────────────┐ │ Most people choose B (conjunction fallacy) │ │ │ │ But: P(A and B) ≤ P(A) always │ │ │ │ The description is "representative" of a feminist, │ │ overriding probability logic │ └─────────────────────────────────────────────────────────────┘ ``` ## Anchoring Heuristic | Scenario | Anchor Effect | |----------|---------------| | Salary negotiation | First number influences final | | Real estate | Listing price anchors offers | | Sentencing | Prosecutor's demand anchors verdict | | Donations | Suggested amounts anchor giving | ## Fast and Frugal Heuristics (Gigerenzer) | Heuristic | Rule | When It Works | |-----------|------|---------------| | **Recognition** | Choose recognized option | When recognition correlates with quality | | **Take-the-best** | Use single best cue | When cues have different validity | | **Tallying** | Count positive features | When cues have equal validity | | **Satisficing** | Accept "good enough" | When search is costly | | **1/N** | Divide equally | When prediction is uncertain | ## Heuristics vs Algorithms | Aspect | Heuristic | Algorithm | |--------|-----------|-----------| | **Speed** | Fast | Slow | | **Effort** | Low | High | | **Accuracy** | "Good enough" | Optimal | | **Information** | Partial | Complete | | **Transparency** | Often unconscious | Explicit | ## Applications | Domain | Heuristic Use | |--------|---------------| | **UX Design** | Recognition heuristics for navigation | | **Marketing** | Anchoring in pricing | | **Medicine** | Diagnostic heuristics (and their pitfalls) | | **AI** | Heuristic search algorithms | | **Personal** | Decision-making under uncertainty | ## References - Kahneman, D. (2011). *Thinking, Fast and Slow* - Gigerenzer, G. (1999). *Simple Heuristics That Make Us Smart* - https://en.wikipedia.org/wiki/Heuristic ## Related - [[Cognitive biases]] - [[Decision Making]] - [[Behavioral Economics]] - [[Daniel Kahneman]] - [[Amos Tversky]] - [[Gerd Gigerenzer]] - [[Bounded Rationality]] - [[Cognitive Psychology]]