BEWarning! TAThe text for this !presentation is Beta!Itʼs from a wiki pagethat is still evolving.Keep this in mindwhile you read thisdocument. Some ofthe cognitive biasesin here might beincorrect wikientries. Hopefully thisdocument will inspiremore cognitiveprofessionals to chipin to make the wikispotless! Eventually,this document will berereleased in pristineform. Until then manyof you have asked fora beta release. Here itis. Also, the imageshave been updated forbetter remixing and A Visual Study Guide to COGNITIVEsharing rights. Ratherthan using permissionbased images, now all BIASESthe images are publicdomain or free non-commercial use byanyone.Operation Fix TheCognitive Bias This document was prepared by Eric Fernandez.Wiki Has Begun! Much of the text within is quoted from the cognitive bias wikipedia pages (written in large part by Martin Poulter) version 2.0
This document is an introductory study guideIt’s for anyone who is trying to study all of the cognitive biases so they can betterunderstand human thought and behavior. It’s based off of the latest Wikipedia entry forcognitive biases (http://en.wikipedia.org/wiki/Cognitive_bias) and because Wikipediaarticles are always a work in progress, this should be thought of as a starting point tostudy more professionally produced material such as Stuart Sutherlands "Irrationality",Cordelia Fines "A Mind of Its Own", Scott Plous "The Psychology of Judgement andDecision Making", Thomas Kidas "Dont Believe Everything You Think."Within, this document you will find each bias presented with a short description and animage to help aid the memory. Clicking on each bias will take you directly to the wikipage where you can learn more.The biases are organized into slides that can beprinted and mounted to mat board to make studyguide cards.color printer spray mount creative dept. mat board cutting board
Legal InformationWikipedia Text (The listed text under each cognitive bias)The Wikipedia text within this document is under a Creative Commons Attribution-ShareAlike License.That means you are free:to Share — to copy, distribute and transmit the textto Remix — to adapt the textUnder the following conditions:Attribution — You must attribute the work in the manner specified by Wikipedia (but not in any waythat suggests that they endorse you or your use of the work).Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting workonly under the same or similar license to this one.ImagesWith the exception of the “Royal Society Of Account Planning” Logo on the front and lastpage, all images on this presentation are either completely public domain or are free touse for all non-commercial purposes. They are also all non-attribution.Presentation as a wholeOther than the need to respect the existing licenses on the wiki text and several of theimages (non-commercial use only), you are free to do whatever you want with thisdocument. You can remix it, mash it up, distribute it however you see fit. Enjoy!
“The beginning ofwisdom, is thedefinition of terms” - Socrates
What is a cognitive bias?Cognitive biases are psychological tendenciesthat cause the human brain to draw incorrectconclusions.Such biases are thought to be a form of "cognitiveshortcut", often based upon rules of thumb, andinclude errors in statistical judgment, socialattribution, and memory.These biases are a common outcome of humanthought, and often drastically skew the reliability ofanecdotal and legal evidence. The phenomenon isstudied in cognitive science and social psychology.Quoted from: http://en.wikipedia.org/wiki/Cognitive_bias
History Amos Tversky Daniel KahnemanThe notion of cognitive biases was introduced by Amos Tversky and Daniel Kahneman in 1972.and grew out of their experience of peoples innumeracy, or inability to reason intuitively with thegreater orders of magnitude. They and their colleagues demonstrated several replicable ways in whichhuman judgments and decisions differ from rational choice theory. They explained these differences interms of heuristics; rules which are simple for the brain to compute but introduce systematic errors. Forinstance the availability heuristic, when the ease with which something comes to mind is used toindicate how often (or how recently) it has been encountered.These experiments grew into the heuristics and biases research program which spread beyondacademic psychology into other disciplines including medicine and political science. It was a majorfactor in the emergence of behavioral economics, earning Kahneman a Nobel Prize in 2002. Tverskyand Kahneman developed prospect theory as a more realistic alternative to rational choice theory.Other biases have been demonstrated in separate experiments, such as the confirmation biasdemonstrated by Peter C. Wason.Quoted from: http://en.wikipedia.org/wiki/Cognitive_bias
conte nts social biases memory biasesdecision-making biases probability /belief biases
19* social biases 19* social biases Forer effect / Barnum effect Dunning-Kruger / Superiority BiasQuoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases The tendency to give high accuracy ratings to descriptions of their Overestimating ones desirable qualities, and underestimating undesirable personality that supposedly are tailored specifically for them, but are qualities, relative to other people. Also known as Superiority bias in fact vague and general enough to apply to a wide range of people. (also known as "Lake Wobegon effect", "better-than-average effect", For example, horoscopes. "superiority bias", or Dunning-Kruger effect). Ingroup bias System justification effect / The tendency for people to give preferential treatment to others they perceive to be members of their own groups. Status Quo Bias The tendency to defend and bolster the status quo. Existing social, economic, and political arrangements tend to be preferred, and Self-fulfilling prophecy alternatives disparaged sometimes even at the expense of individual and collective self-interest. (See also status quo bias.) The tendency to engage in behaviors that elicit results which will (consciously or not) confirm existing attitudes. Illusion of asymmetric insight Halo effect People perceive their knowledge of their peers to surpass their peers knowledge of them. The tendency for a persons positive or negative traits to "spill over" from one area of their personality to another in others perceptions of them (see also physical attractiveness stereotype). Illusion of transparency Ultimate attribution error People overestimate others ability to know them, and they also overestimate their ability to know others. Similar to the fundamental attribution error, in this error a person is likely to make an internal attribution to an entire group instead of the individuals within the group. Herd instinct False consensus effect Common tendency to adopt the opinions and follow the behaviors of the majority to feel safer and to avoid conflict. The tendency for people to overestimate the degree to which others agree with them. Fundamental attribution error / Self-serving bias / Actor-observer bias Behavioral confirmation effect The tendency for people to over-emphasize personality-based The tendency to claim more responsibility for successes than explanations for behaviors observed in others while under- failures. It may also manifest itself as a tendency for people to emphasizing the role and power of situational influences on the same evaluate ambiguous information in a way beneficial behavior (see also actor-observer bias, group attribution error, to their interests (see also group-serving bias). positivity effect, and negativity effect). Notational bias = Projection bias A form of cultural bias in which the notational conventions of The tendency to unconsciously assume that others share the recording data biases the appearance of that data toward (or away same or similar thoughts, beliefs, values, or positions. from) the system upon which the notational schema is based. Egocentric bias Outgroup homogeneity bias Occurs when people claim more responsibility for themselves ME us them Individuals see members of their own group as being relatively more varied than members of other groups. for the results of a joint action than an outside observer would. Just-world phenomenon Trait ascription bias The tendency for people to believe that the world is just and I You The tendency for people to view themselves as relatively variable in terms of therefore people "get what they deserve." personality, behavior and mood while viewing others as much more predictable. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 8* memory biases 8* memory biases Suggestibility Rosy retrospection A form of misattribution where The tendency to rate past events ideas suggested by a questioner more positively than they had actually are mistaken for memory. rated them when the event occurred. Reminiscence bump Self-serving bias The effect that people tend to Perceiving oneself responsible for recall more personal events from desirable outcomes but not adolescence and early adulthood responsible for undesirable ones. than from other lifetime periods. Egocentric bias Cryptomnesia / Recalling the past in a False memory self-serving manner, e.g. A form of misattribution where a remembering ones exam grades memory is mistaken for imagination, as being better than they were, or or the confusion of true memories remembering a caught ﬁsh as with false memories. being bigger than it was. Hindsight bias Consistency bias Filtering memory of past events Incorrectly remembering ones past through present knowledge, so that attitudes and behavior as resembling those events look more predictable present attitudes and behavior. than they actually were; also known as the I-knew-it-all-along effect. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 42* decision-making biases 42* decision-making biases Negativity bias Hyperbolic discounting The tendency for people to have a + Phenomenon by which humans pay more attention to and give stronger preference for more more weight to negative than immediate payoffs relative to later - positive experiences or other payoffs, where the tendency kinds of information. increases the closer to the present both payoffs are. Interloper effect / Consultation paradox Irrational escalation The tendency to value third party The tendency to make irrational consultation as objective, conﬁrming, decisions based upon rational and without motive. Also consultation decisions in the past or to justify paradox, the conclusion that solutions actions already taken. proposed by existing personnel within an organization are less likely to receive support than from those recruited for that purpose. Omission bias The tendency to judge Normalcy bias harmful actions as worse, or The refusal to plan for, or less moral, than equally react to, a disaster which harmful omissions (inactions). has never happened before. Mere exposure effect Neglect of probability The tendency for people to express The tendency to completely undue liking for things merely disregard probability when making because they are familiar with them. a decision under uncertainty. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 42* decision-making biases 42* decision-making biases Planning fallacy Semmelweis reflex The tendency to reject new The tendency to underestimate evidence that contradicts an task-completion times. established paradigm. Déformation professionnelle Not Invented Here The tendency to look at things The tendency to ignore that a according to the conventions of product or solution already exists, ones own profession, forgetting because its source is seen as an any broader point of view. "enemy" or as "inferior". Impact bias Moral credential effect The tendency for people to The tendency of a track record of overestimate the length or non-prejudice to increase the intensity of the impact of subsequent prejudice. future feeling states. Bias blind spot Base rate fallacy The tendency not to Ignoring available statistical compensate for ones data in favor of particulars. own cognitive biases. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 42* decision-making biases 42* decision-making biases Focusing effect Framing Using an approach or description Prediction bias occurring when of the situation or issue that is people place too much importance too narrow. Also framing effect – on one aspect of an event; causes drawing different conclusions error in accurately predicting the based on how data is presented. utility of a future outcome. Experimenters Illusion of control or Expectation bias The tendency for human beings The tendency for experimenters to to believe they can control or at believe, certify, and publish data that least inﬂuence outcomes that agree with their expectations for the they clearly cannot. outcome of an experiment, and to disbelieve, discard, or downgrade the corresponding weightings for data that appear to conﬂict with those expectations. Outcome bias The tendency to judge a decision by its eventual outcome instead of Information bias based on the quality of the decision The tendency to seek information at the time it was made. even when it cannot affect action. Post-purchase Extraordinarity bias The tendency to value an object rationalization more than others in the same The tendency to persuade oneself category as a result of an through rational argument that a extraordinarity of that object that purchase was a good value. does not, in itself, change the value. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 42* decision-making biases 42* decision-making biases Distinction bias Confirmation bias The tendency to view two The tendency to search for options as more dissimilar or interpret information in a when evaluating them way that conﬁrms ones simultaneously than when preconceptions. evaluating them separately. Choice- Contrast effect supportive bias A B The enhancement or diminishing The tendency to remember of a weight or other measurement ones choices as better when compared with a recently than they actually were. observed contrasting object. Endowment effect / Loss aversion Bandwagon effect The tendency to do (or believe) "the fact that people often things because many other people demand much more to give up do (or believe) the same. Related to an object than they would be groupthink and herd behavior. willing to pay to acquire it". (see also sunk cost effects) Congruence bias Denomination effect The tendency to test The tendency to spend more money hypotheses exclusively when it is denominated in small through direct testing, in amounts (e.g. coins) rather than contrast to tests of possible large amounts (e.g. bills). alternative hypotheses. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 42* decision-making biases 42* decision-making biases Wishful thinking Selective perception The formation of beliefs and the The tendency for expectations to making of decisions according to what affect perception. is pleasing to imagine instead of by appeal to evidence or rationality. Restraint bias The tendency to overestimate ones ability to show restraint in the face of temptation. 0 Zero-risk bias Preference for reducing a small risk to zero over a greater reduction in a larger risk. Reactance Von Restorff effect The urge to do the opposite of what The tendency for an item that "stands someone wants you to do out of a need out like a sore thumb" to be more likely to resist a perceived attempt to constrain to be remembered than other items. your freedom of choice. Pseudocertainty effect Status quo bias + RISK The tendency to make risk-averse The tendency for people to like things to stay - choices if the expected outcome is relatively the same (see also loss aversion, positive, but make risk-seeking endowment effect, and system justiﬁcation). choices to avoid negative outcomes. Need for Closure Money illusion The need to reach a verdict in important The tendency of people to matters; to have an answer and to escape concentrate on the nominal (face the feeling of doubt and uncertainty. The value) of money rather than its personal context (time or social pressure) value in terms of purchasing power. might increase this bias. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
probability/ belief biases
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 35* probability / belief biases 35* probability / belief biases Texas sharpshooter fallacy Positive outcome bias The fallacy of selecting or adjusting a + + The tendency to overestimate the hypothesis after the data is collected, probability of good things happening making it impossible to test the hypothesis to them (see also wishful thinking, fairly. Refers to the concept of ﬁring shots optimism bias, and valence effect). at a barn door, drawing a circle around the best group, and declaring that to be the target. Pareidolia Telescoping effect A vague and random stimulus (often an The effect that recent events image or sound) is perceived as appear to have occurred more signiﬁcant, e.g., seeing images of remotely and remote events appear animals or faces in clouds, the man in to have occurred more recently. the moon, and hearing hidden messages on records played in reverse. Survivorship bias The tendency to concentrate on Outcome bias the people or things that The tendency to judge a decision "survived" some process and by its eventual outcome instead of ignoring those that didnt, or based on the quality of the decision arguing that a strategy is effective at the time it was made. given the winners, while ignoring the large amount of losers. Disregard of regression Selection bias toward the mean A distortion of evidence or The tendency to expect extreme data that arises from the way performance to continue. that the data are collected. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 35* probability / belief biases 35* probability / belief biases Gamblers fallacy Overconfidence effect The tendency to think that future Excessive conﬁdence in ones own probabilities are altered by past answers to questions. For example, events, when in reality they are for certain types of question, answers unchanged. Results from an that people rate as "99% certain" turn erroneous conceptualization of the out to be wrong 40% of the time. Law of large numbers. For example, "Ive ﬂipped heads with this coin ﬁve times consecutively, so the chance of tails coming out on the sixth ﬂip is much greater than heads." Hindsight bias Sometimes called the "I-knew-it-all-along" effect, the tendency to see past events Clustering illusion as being predictable. The tendency to see patterns where actually none exist. Gilovich example: "OXXXOXXXOXXOOOXOOXXOO" Observer- expectancy effect When a researcher expects a given result and therefore Illusory correlation unconsciously manipulates an Beliefs that inaccurately suppose a experiment or misinterprets relationship between a certain data in order to ﬁnd it (see also type of action and an effect. subject-expectancy effect). Hawthorne effect Last illusion The tendency to perform or The belief that someone perceive differently when one must know what is going on. knows they are being observed. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 35* probability / belief biases 35* probability / belief biases Availability cascade Availability heuristic A self-reinforcing process in which a Estimating what is more likely by collective belief gains more and what is more available in memory, more plausibility through its which is biased toward vivid, unusual, increasing repetition in public or emotionally charged examples. discourse (or "repeat something long enough and it will become true"). Belief bias An effect where someones evaluation of the logical strength of an argument is biased by the believability of the conclusion. ? > Conjunction fallacy The tendency to assume that speciﬁc conditions are more probable than general ones. Ambiguity effect The tendency to avoid options for which missing information makes Ostrich effect the probability seem "unknown". Ignoring an obvious (negative) situation. Capability bias The tendency to believe that the Attentional bias closer average performance is to a target, the tighter the The tendency to neglect relevant distribution of the data set. data when making judgments of a correlation or association. Authority bias Disposition effect The tendency to value an ambiguous stimulus (e.g., an art The tendency to sell assets that performance) according to the have increased in value but hold opinion of someone who is seen assets that have decreased in value. as an authority on the topic. *number listed here is not an academic fact, it is simply listed to aid the memorization process.
Quoted from http://en.wikipedia.org/wiki/List_of_cognitive_biases 35* probability / belief biases 35* probability / belief biases Stereotyping Recency effect Expecting a member of a group to have certain characteristics / Peak-end rule without having actual information The tendency to weigh recent about that individual. events more than earlier events . Subjective validation perception that something is true if Primacy effect 1st a subjects belief demands it to be The tendency to weigh initial events true. Also assigns perceived more than subsequent events. connections between coincidences. Subadditivity effect > Neglect of prior The tendency to judge probability of the whole to be less than the probabilities of the parts. base rates effect The tendency to neglect known odds when reevaluating odds in light of weak evidence. Well travelled road effect Underestimation of the duration taken to traverse oft-traveled routes and over-estimate the duration taken to traverse less familiar routes. Anchoring effect Optimism bias The tendency to rely too heavily, or The tendency to be over- "anchor," on a past reference or on optimistic about the outcome one trait or piece of information when of planned actions. making decisions (also called "insufﬁcient adjustment"). *number listed here is not an academic fact, it is simply listed to aid the memorization process.
If you are a cognitive expert, join “Operation Fix TheCognitive Bias Wiki!” Add your suggestion here: http://en.wikipedia.org/wiki/Talk:List_of_cognitive_biases.This document will be updated periodically as the Wikiimproves. Thank you for your interest!