A Visual Study Guide to
Cognitive
Biases
Prepared by Eric Fernandez - RoyalSocietyOfAccountPlanning.blogspot.com
This document is a study guide
It’s for anyone who is trying to memorize all of the cognitive
biases so they can better understand human thought and
behavior. It’s especially recommended for account planners,
marketers, and students of psychology / cognitive science.
Within, you will find each bias presented with a short description
and an image to help aid the memory. Clicking on each bias will
take you directly to the wiki page where you can learn more.
The biases are organized into slides
that can be printed and mounted to
mat board to make study guide cards.
color printer
spray mount
creative dept. mat board
cutting board
“The beginning of
wisdom, is the
definition of terms”
- Socrates
What is a cognitive bias?
Cognitive biases are psychological tendencies
that cause the human brain to draw incorrect
conclusions.
Such biases are thought to be a form of "cognitive
shortcut", often based upon rules of thumb, and
include errors in statistical judgment, social
attribution, and memory.
These biases are a common outcome of human
thought, and often drastically skew the reliability of
anecdotal and legal evidence. The phenomenon is
studied in cognitive science and social psychology.
http://en.wikipedia.org/wiki/Cognitive_bias
History
Amos Tversky
Daniel Kahneman
The notion of cognitive biases was introduced by Amos Tversky and Daniel Kahneman in 1972.
and grew out of their experience of people's innumeracy, or inability to reason intuitively with the
greater orders of magnitude. They and their colleagues demonstrated several replicable ways in which
human judgments and decisions differ from rational choice theory. They explained these differences in
terms of heuristics; rules which are simple for the brain to compute but introduce systematic errors. For
instance the availability heuristic, when the ease with which something comes to mind is used to
indicate how often (or how recently) it has been encountered.
These experiments grew into the heuristics and biases research program which spread beyond
academic psychology into other disciplines including medicine and political science. It was a major
factor in the emergence of behavioral economics, earning Kahneman a Nobel Prize in 2002. Tversky
and 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 bias
demonstrated by Peter C. Wason.
http://en.wikipedia.org/wiki/Cognitive_bias
conte
nts
The 19 social
biases
The 8 memory
biases
The 42 decisionmaking biases
The 36 probability /
belief biases
The 19
social biases
The 19 social biases
The 19 social biases
Forer effect / Barnum effect
System justification effect /
Status Quo Bias
The tendency to give high accuracy ratings to descriptions of their
personality that supposedly are tailored specifically for them, but are
in fact vague and general enough to apply to a wide range of people.
For example, horoscopes.
The tendency to defend and bolster the status quo. Existing social,
economic, and political arrangements tend to be preferred, and
alternatives disparaged sometimes even at the expense of individual
and collective self-interest. (See also status quo bias.)
Ingroup bias
The tendency for people to give preferential
treatment to others they perceive to be
members of their own groups.
Dunning-Kruger / Superiority Bias
Overestimating one's desirable qualities, and underestimating undesirable
qualities, relative to other people. Also known as Superiority bias
(also known as "Lake Wobegon effect", "better-than-average effect",
"superiority bias", or Dunning-Kruger effect).
Self-fulfilling prophecy
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 person's 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).
Herd instinct
Ultimate attribution error
Common tendency to adopt the opinions and follow the
behaviors of the majority to feel safer and to avoid conflict.
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.
Illusion of transparency
False consensus effect
People overestimate others' ability to know them, and they also
overestimate their ability to know others.
The tendency for people to overestimate the degree to
which others agree with them.
Fundamental attribution error /
Actor-observer bias
Self-serving bias /
Behavioral confirmation effect
The tendency for people to over-emphasize personality-based
explanations for behaviors observed in others while underemphasizing the role and power of situational influences on the same
behavior (see also actor-observer bias, group attribution error,
positivity effect, and negativity effect).
The tendency to claim more responsibility for successes than
failures. It may also manifest itself as a tendency for people to
evaluate ambiguous information in a way beneficial
to their interests (see also group-serving bias).
Notational bias
Egocentric bias
Occurs when people claim more responsibility for themselves
for the results of a joint action than an outside observer would.
Just-world phenomenon
The tendency for people to believe that the world is just and
therefore people "get what they deserve."
Projection bias
=
A form of cultural bias in which the notational conventions of
recording data biases the appearance of that data toward (or away
from) the system upon which the notational schema is based.
The tendency to unconsciously assume that others share the
same or similar thoughts, beliefs, values, or positions.
us
them
I
You
Outgroup homogeneity bias
Individuals see members of their own group as being relatively
more varied than members of other groups.
Trait ascription bias
The tendency for people to view themselves as relatively variable in terms of
personality, behavior and mood while viewing others as much more predictable.
The 8
memory biases
The 8 memory biases
Suggestibility
The 8 memory biases
Rosy retrospection
A form of misattribution where
ideas suggested by a questioner
are mistaken for memory.
The tendency to rate past events
more positively than they had actually
rated them when the event occurred.
Reminiscence bump
Self-serving bias
The effect that people tend to
recall more personal events from
adolescence and early adulthood
than from other lifetime periods.
Cryptomnesia /
False memory
A form of misattribution where a
memory is mistaken for imagination,
or the confusion of true memories
with false memories.
Perceiving oneself responsible for
desirable outcomes but not
responsible for undesirable ones.
Egocentric bias
Recalling the past in a
self-serving manner, e.g.
remembering one's exam grades
as being better than they were, or
remembering a caught fish as
being bigger than it was.
Hindsight bias
Consistency bias
Incorrectly remembering one's past
attitudes and behaviour as resembling
present attitudes and behavior.
Filtering memory of past events
through present knowledge, so that
those events look more predictable
than they actually were; also known as
the 'I-knew-it-all-along effect'.
The 42 decisionmaking biases
The 42 decision-making biases
Hyperbolic discounting
The tendency for people to have a
stronger preference for more
immediate payoffs relative to later
payoffs, where the tendency
increases the closer to the present
both payoffs are.
The 42 decision-making biases
Negativity bias
Phenomenon by which humans
pay more attention to and give
more weight to negative than
positive experiences or other
kinds of information.
Interloper effect /
Consultation paradox
Irrational escalation
The tendency to make irrational
decisions based upon rational
decisions in the past or to justify
actions already taken.
The tendency to value third party
consultation as objective, confirming,
and without motive. Also consultation
paradox, the conclusion that solutions
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
harmful actions as worse, or
less moral, than equally
harmful omissions (inactions).
Mere exposure effect
The tendency for people to express
undue liking for things merely
because they are familiar with them.
Normalcy bias
The refusal to plan for, or
react to, a disaster which
has never happened before.
Neglect of probability
The tendency to completely
disregard probability when making
a decision under uncertainty.
The 42 decision-making biases
Focusing effect
Prediction bias occurring when
people place too much importance
on one aspect of an event; causes
error in accurately predicting the
utility of a future outcome.
Illusion of control
The tendency for human beings
to believe they can control or at
least influence outcomes that
they clearly cannot.
The 42 decision-making biases
Framing
Using an approach or description
of the situation or issue that is
too narrow. Also framing effect –
drawing different conclusions
based on how data is presented.
Experimenter's
or Expectation bias
The tendency for experimenters to
believe, certify, and publish data that
agree with their expectations for the
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
based on the quality of the decision
at the time it was made.
Post-purchase
rationalization
The tendency to persuade oneself
through rational argument that a
purchase was a good value.
Information bias
The tendency to seek information
even when it cannot affect action.
Extraordinarity bias
The tendency to value an object
more than others in the same
category as a result of an
extraordinarity of that object that
does not, in itself, change the value.
The 42 decision-making biases
Planning fallacy
The tendency to underestimate
task-completion times.
Déformation
professionnelle
The tendency to look at things
according to the conventions of
one's own profession, forgetting
any broader point of view.
The 42 decision-making biases
Semmelweis reflex
The tendency to reject new
evidence that contradicts an
established paradigm.
Not Invented Here
The tendency to ignore that a
product or solution already exists,
because its source is seen as an
"enemy" or as "inferior".
Impact bias
The tendency for people to
overestimate the length or
the intensity of the impact of
future feeling states.
Bias blind spot
The tendency not to
compensate for one's
own cognitive biases.
Moral credential effect
The tendency of a track record of
non-prejudice to increase
subsequent prejudice.
Base rate fallacy
Ignoring available statistical
data in favor of particulars.
The 42 decision-making biases
The 42 decision-making biases
Distinction bias
Confirmation bias
The tendency to search for
or interpret information in a
way that confirms one's
preconceptions.
Choicesupportive bias
The tendency to remember
one's choices as better
than they actually were.
Endowment effect
/ Loss aversion
"the fact that people often
demand much more to give up
an object than they would be
willing to pay to acquire it".
The tendency to view two
options as more dissimilar
when evaluating them
simultaneously than when
evaluating them separately.
Contrast effect
The enhancement or diminishing
of a weight or other measurement
when compared with a recently
observed contrasting object.
Bandwagon effect
The tendency to do (or believe)
things because many other people
do (or believe) the same. Related to
groupthink and herd behaviour.
(see also sunk cost effects)
Congruence bias
Denomination effect
The tendency to test
hypotheses exclusively
through direct testing, in
contrast to tests of possible
alternative hypotheses.
The tendency to spend more money
when it is denominated in small
amounts (e.g. coins) rather than
large amounts (e.g. bills).
The 42 decision-making biases
The 42 decision-making biases
Wishful thinking
Selective perception
The formation of beliefs and the
making of decisions according to what
is pleasing to imagine instead of by
appeal to evidence or rationality.
The tendency for expectations to
affect perception.
0
Restraint bias
The tendency to overestimate
one's ability to show restraint
in the face of temptation.
The urge to do the opposite of what
someone wants you to do out of a need
to resist a perceived attempt to constrain
your freedom of choice.
The tendency for an item that "stands
out like a sore thumb" to be more likely
to be remembered than other items.
The tendency to make risk-averse
choices if the expected outcome is
positive, but make risk-seeking
choices to avoid negative outcomes.
Money illusion
The tendency of people to
concentrate on the nominal (face
value) of money rather than its
value in terms of purchasing power.
Preference for reducing a small risk to zero
over a greater reduction in a larger risk.
Reactance
Von Restorff effect
Pseudocertainty effect
Zero-risk bias
+
-
Status quo bias
The tendency for people to like things to stay
relatively the same (see also loss aversion,
endowment effect, and system justification).
Need for Closure
The need to reach a verdict in important
matters; to have an answer and to escape
the feeling of doubt and uncertainty. The
personal context (time or social pressure)
might increase this bias.
The 36 probability
/ belief biases
The 36 probability / belief biases
Positive outcome bias
The tendency to overestimate the
probability of good things happening
to them (see also wishful thinking,
optimism bias, and valence effect).
Telescoping effect
The effect that recent events
appear to have occurred more
remotely and remote events appear
to have occurred more recently.
Survivorship bias
The tendency to concentrate on
the people or things that
"survived" some process and
ignoring those that didn't, or
arguing that a strategy is effective
given the winners, while ignoring
the large amount of losers.
Selection bias
A distortion of evidence or
data that arises from the way
that the data are collected.
The 36 probability / belief biases
Texas sharpshooter fallacy
The fallacy of selecting or adjusting a
hypothesis after the data is collected,
making it impossible to test the hypothesis
fairly. Refers to the concept of firing shots
at a barn door, drawing a circle around the
best group, and declaring that to be
the target.
Pareidolia
A vague and random stimulus (often an
image or sound) is perceived as
significant, e.g., seeing images of
animals or faces in clouds, the man in
the moon, and hearing hidden
messages on records played in reverse.
Outcome bias
The tendency to judge a decision
by its eventual outcome instead of
based on the quality of the decision
at the time it was made.
Disregard of regression
toward the mean
The tendency to expect extreme
performance to continue.
The 36 probability / belief biases
Overconfidence effect
Excessive confidence in one's own
answers to questions. For example,
for certain types of question, answers
that people rate as "99% certain" turn
out to be wrong 40% of the time.
Observerexpectancy effect
When a researcher expects a
given result and therefore
unconsciously manipulates an
experiment or misinterprets
data in order to find it (see also
subject-expectancy effect).
Hindsight bias
Sometimes called the
"I-knew-it-all-along" effect, the
tendency to see past events
as being predictable.
Hawthorne effect
The tendency to perform or
perceive differently when one
knows they are being observed.
The 36 probability / belief biases
Gambler's fallacy
The tendency to think that future
probabilities are altered by past
events, when in reality they are
unchanged. Results from an
erroneous conceptualization of the
Law of large numbers. For example,
"I've flipped heads with this coin five
times consecutively, so the chance of
tails coming out on the sixth flip is
much greater than heads."
Clustering illusion
The tendency to see patterns where
actually none exist. Gilovich example:
"OXXXOXXXOXXOOOXOOXXOO"
Illusory correlation
Beliefs that inaccurately suppose a
relationship between a certain
type of action and an effect.
Last illusion
The belief that someone
must know what is going on.
The 36 probability / belief biases
The 36 probability / belief biases
Availability cascade
Availability heuristic
A self-reinforcing process in which a
collective belief gains more and
more plausibility through its
increasing repetition in public
discourse (or "repeat something long
enough and it will become true").
Estimating what is more likely by
what is more available in memory,
which is biased toward vivid, unusual,
or emotionally charged examples.
Belief bias
An effect where someone's
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
Ostrich effect
The tendency to avoid options for
which missing information makes
the probability seem "unknown".
Ignoring an obvious
(negative) situation.
Capability bias
Attentional bias
The tendency to neglect relevant
data when making judgments of a
correlation or association.
The tendency to believe that the
closer average performance is
to a target, the tighter the
distribution of the data set.
Authority bias
Disposition effect
The tendency to sell assets that
have increased in value but hold
assets that have decreased in value.
The tendency to value an
ambiguous stimulus (e.g., an art
performance) according to the
opinion of someone who is seen
as an authority on the topic.
The 36 probability / belief biases
The 36 probability / belief biases
Stereotyping
Recency effect
/ Peak-end rule
Expecting a member of a group
to have certain characteristics
without having actual information
about that individual.
The tendency to weigh recent
events more than earlier events .
Primacy effect
1st
Subjective validation
perception that something is true if
a subject's belief demands it to be
true. Also assigns perceived
connections between coincidences.
The tendency to weigh initial events
more than subsequent events.
Optimism bias
The tendency to be overoptimistic about the outcome
of planned actions.
Subadditivity effect
The tendency to judge probability
of the whole to be less than the
probabilities of the parts.
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
The tendency to rely too heavily, or
"anchor," on a past reference or on
one trait or piece of information when
making decisions (also called
"insufficient adjustment").
>
Neglect of prior
base rates effect
The tendency to neglect known
odds when reevaluating odds
in light of weak evidence.
Disposition effect
The tendency to sell assets that
have increased in value but hold
assets that have decreased in value.