Cognitive Biases: A Library of How We Think, Distort, and Decide

Explore the mental shortcuts that shape perception, judgment, and behavior—often without us realizing it.

Your brain is not designed to be objective. It’s designed to survive. And that means it takes shortcuts; shortcuts we call cognitive biases. This library explores the most common distortions that shape our decisions, relationships, and self-perception. Each entry unpacks a single bias, shows how it shows up in everyday life, and offers tools for seeing through it.

RJ Starr RJ Starr

Optimism Bias: Why We Think the Future Will Magically Work Out

Optimism bias makes us believe bad things won’t happen to us—but might happen to others. This cognitive illusion can feel empowering but often leads to risky planning, overcommitment, and overlooked warning signs. Explore how this common distortion shapes your sense of certainty, and what it takes to see clearly.

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Clustering Illusion: Why We See Patterns That Aren’t Really There

The clustering illusion tricks us into finding meaningful patterns in random data. From gambling streaks to medical scares, our brains search for coherence—even when events are purely coincidental. This bias fuels superstition, misjudged risks, and overreactions. Learn how to step back and see randomness for what it is.

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Spotlight Effect: Why We Think Everyone’s Noticing Us

The spotlight effect tricks us into believing everyone is paying attention to our mistakes, flaws, or appearance—when they’re not. This cognitive bias amplifies self-consciousness, distorts our confidence, and quietly shapes how we show up in the world. Learn how to step out from under the imaginary spotlight.

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Representativeness Heuristic: Why We Trust Stereotypes Over Statistics

The representativeness heuristic makes us judge people and events based on how well they fit a mental prototype—often ignoring actual data. From hiring bias to courtroom errors, this cognitive shortcut swaps statistical reasoning for surface resemblance. Learn how to override the urge to go with “what seems right.”

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RJ Starr RJ Starr

Availability Heuristic: Why the Most Vivid Examples Always Win

The availability heuristic leads us to believe something is more likely or true simply because it’s easier to recall. This vivid-memory bias affects our fears, judgments, and decisions—often without us realizing it. Learn how emotionally charged events distort logic and how to think beyond the loudest memory.

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RJ Starr RJ Starr

Overconfidence Bias: Why We Think We're More Right Than We Are

Overconfidence bias is our tendency to overestimate our knowledge, accuracy, and skill—often without realizing it. From false memories to failed predictions, this entry explores why we’re so sure of ourselves, even when we’re wrong, and how to recalibrate our thinking without losing our self-trust.

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Mood-Driven Thinking: How Emotions Quietly Rewrite Our Logic

Mood-driven thinking occurs when our emotional state distorts how we interpret situations, assess others, and make decisions—often without our awareness. This entry explores how mood influences thought, why it happens, and how to separate real insight from emotional interference.

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Belief Bias: When the Truth Depends on What You Already Think

Belief bias is our tendency to accept arguments that align with what we already believe—even if they’re logically weak—and reject sound reasoning if the conclusion feels wrong. This entry explores how belief bias distorts judgment, fuels polarization, and keeps us stuck in echo chambers of our own making.

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Semmelweis Reflex: Why We Reject New Ideas That Challenge Old Beliefs

The Semmelweis Reflex is the knee-jerk rejection of new ideas simply because they challenge old beliefs. From workplace resistance to cultural pushback, this bias keeps us tethered to the past. This entry explores the psychology behind it—and how to recognize and release it when growth is calling.

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Effort Justification: Why We Overvalue What We’ve Worked Hard For

Effort justification convinces us that anything we struggled for must be worth it—even when it isn’t. This bias distorts our decisions, keeps us clinging to sunk costs, and inflates mediocre outcomes. In this entry, learn why we defend our effort and how to break free from the illusion of earned value.

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Risk Compensation: Why We Take More Risks When We Feel Safe

Risk compensation happens when safety features—physical or emotional—make us behave more recklessly. From seatbelts to long-term relationships, the safer we feel, the more risks we unconsciously take. This entry unpacks how the bias works and shows how to stay grounded even when things feel secure.

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The Planning Fallacy: Why We Underestimate How Long Everything Takes

We underestimate how long tasks will take—even when we’ve done them before. The planning fallacy leads us to overcommit, underdeliver, and blame ourselves for being “bad at time management.” This entry breaks down the bias, explores why it persists, and offers tools to recalibrate your expectations with reality.

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