Self-Perception Biases & Heuristics

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Abstractions that explain systematic distortions in judging oneself and others, covering self-enhancement effects (illusory superiority, self-serving bias, worse-than-average effect), attribute-substitution heuristics (availability heuristic, halo effect, focusing effect), and egocentric-transfer phenomena (implicit egotism, name-letter effect, mere ownership effect).

21 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Attribute Substitution — The dual-process mechanism behind a whole family of judgment biases: when a target attribute is hard to assess, the mind unconsciously swaps in an easier, correlated attribute and reports its value — producing a confident but directionally biased answer.
• Availability Heuristic — The systematic human tendency to judge how frequent or probable an event is by how easily instances of it come to mind, so retrieval fluency stands in for frequency and estimates track what is memorable rather than what is common.
• Barnum Effect — The tendency to accept vague, high-base-rate personality descriptions as strikingly accurate accounts of oneself when framed as personally intended — because the reader privately narrows a statement that actually fits almost everyone.
• Bias Blind Spot — Explain why people spot biases in others but not themselves — self-assessment defaults to an introspective channel (a felt sense of careful reasoning) that is constitutively blind to the automatic biases the behavioral channel reveals in others, so awareness of a bias does not close the gap.
• Birthday-Number Effect — The small implicit preference for numbers in one's own birth date over neutral ones — a valence-transfer effect from the implicit-egotism family, real only in the residual that survives controls for a number's baseline pleasantness and cohort base rates.
• Comparative Self-Assessment Crossover — When people estimate their standing from their own felt ability while underweighting the peer distribution, perceived task difficulty selects the direction of error: above average on easy tasks and below average on hard ones.
• Egocentric Bias — Trace a family of social-judgment miscalibrations to one asymmetry — the self's mental contents are available by default while other minds must be inferred at cost — so the self serves as an anchor from which adjustment is systematically insufficient.
• Focusing Effect (Focusing Illusion) — Systematically overweight whatever attribute attention currently rests on when judging a complex multi-attribute target, so the focused feature dominates the constructed evaluation far above its real causal contribution while everything below the attentional threshold recedes.
• Halo Effect — Explain why a judge's positive impression of one salient attribute of a target inflates ratings of its structurally unrelated attributes — treating a same-judge same-target rating correlation as an upper bound on, not an estimate of, the true trait correlation.
• Illusory Superiority — The aggregate finding that a clear majority of people place themselves above their reference group's median on desirable traits — mathematically impossible — because unconstrained self-rating shifts each person slightly upward until the summed biases overflow the distributional ceiling.
• Implicit Egotism — Transfer an agent's default positive evaluation of self to otherwise neutral targets linked to that self — names, birthday digits, possessions, places, or roles — so association alone tilts preference without deliberate self-reference.
• Introspection Illusion — People overweight felt access to their own reasons and intentions while judging others from behavior, so absence of an introspectable motive is mistaken for absence of that motive or process in oneself.
• Mere Ownership Effect — The finding that merely possessing an object — even briefly, even when assigned at random — raises a person's evaluation of it, because the self's positive bias transfers to whatever gets tagged 'mine' ('mine is good because I am good').
• Naive Realism — Explain intractable disagreement as the converging conviction that one perceives the world directly, that all rational observers would agree, and that dissenters must be biased — relocating the dispute from the facts to each party's invisible construction of them.
• Name-Letter Effect — Measure implicit self-positivity by the small, aggregate-only elevation in how much people like their own name-letters on a task framed as purely aesthetic and not cued to the self — a proxy that vanishes the instant self-relevance is made salient.
• Overjustification Effect — The pattern where a salient external reward for an already-intrinsically-motivated activity makes the agent reattribute their motive to the reward, so that when the reward stops, activity falls below its pre-reward baseline — a crowding-out, not an augmenting, of motivation.
• Possibility Effect — People systematically overweight very small probabilities in risky choice, because crossing from impossible to barely-possible is a categorical shift in how an outcome is represented — the steep small-p branch of prospect theory's inverse-S weighting function.
• Self-Serving Bias — The directional asymmetry by which agents credit their own successes to internal factors (ability, effort) and blame failures on external ones (luck, circumstance) to protect self-image — making any self-report about one's own outcome a biased evidence class with a known lean.
• Social-Desirability Bias — A self-report distortion in which perceived social approval shifts an elicited answer toward what seems more acceptable.
• Spotlight Effect — Explain the felt certainty that everyone noticed as an estimation error: the actor anchors on how salient a self-feature is from the inside and under-corrects toward observers' far lower base-rate attention, so predicted notice runs about double the actual.
• Worse-than-Average Effect — The reversal of self-enhancement on hard, expert-dominated tasks, where most people rate themselves below average because self-ratings anchor on one's own absolute perceived skill and ignore the distribution of others — the sign of the bias set by perceived task difficulty.