Cognitive errors vs emotional biases
Cognitive errors come from faulty reasoning: missing information, bad statistics or memory slips. They can usually be corrected with better information or education. Emotional biases come from feelings and impulses, so they are hard to correct; an adviser often adapts the portfolio to them instead.
Before this: Basics of Portfolio Planning and Construction
On the exam
- Compare and contrast cognitive errors and emotional biases
Compare and contrast cognitive errors and emotional biases. Expect a classification item ("which of these is an emotional bias?") or "should the adviser moderate or adapt?".
How deeply to learn each part
- Know the idea
- Understand it in general. It frames other topics, but you will not calculate with it.
- Use it
- Understand it well enough to solve a question with it. Recognize when it applies.
- Memorize
- Learn it by heart. The exam will not give it to you.
You know this one. The full lesson is folded away. The takeaways, formulas and checkpoint below are your quick refresher, and the checkpoint is a fair test of whether you still do.
You tested strong here. The full lesson is folded away. The takeaways, formulas and checkpoint below are your quick refresher, and the checkpoint is a fair test of whether you still know it.
What are the two families of behavioral bias?
A behavioral bias is a systematic way in which people’s decisions depart from the fully rational choice that traditional finance assumes. The bias can come from a thinking mistake or from a feeling, and that single distinction drives most of what follows.
- A cognitive error comes from faulty reasoning: a statistical slip, a memory slip or illogical information processing. Better information, education and advice can usually reduce it.
- An emotional bias comes from impulse and intuition. It arises without conscious effort, and the person may not even want to feel it. That makes it hard to correct.
| Cognitive errors | Emotional biases | |
|---|---|---|
| Source | reasoning, memory, information processing | feelings, intuition, impulses |
| Can it be corrected? | usually, with information, education, advice | hard to correct |
| Adviser’s response | moderate (reduce the bias) | often adapt (build the portfolio around it) |
| Sub-groups | belief perseverance; information processing | one family of six |
Many biases mix both sources. The classification is about the main driver. Overconfidence, for example, has a cognitive element, but it is filed under emotional because it springs mainly from emotion.
Where does each of the fifteen biases belong?
Cognitive errors split in two. A belief perseverance bias is a way of clinging to what we already believe, driven by the discomfort of conflicting information (cognitive dissonance). An information-processing bias is a flaw in how facts and numbers are used, with less to do with beliefs or memory.
- Cognitive errors Memorize faulty reasoning; fix with information and education
- Belief perseverance Memorize cling to what we already believe
- Conservatismslow to update
- Confirmationseek agreeing evidence
- Representativenessjudge by resemblance
- Illusion of controlthink we steer outcomes
- Hindsight"I knew it all along"
- Information processing Memorize use facts and numbers illogically
- Anchoring and adjustmentstuck on a starting number
- Mental accountingmoney sorted into buckets
- Framingthe wording changes the answer
- Availabilityeasy to recall means likely
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- Emotional biases Memorize feelings and impulses; hard to correct, so adapt
- Loss aversion losses hurt more than gains please
- Overconfidence unwarranted faith in own ability
- Self-control now beats later
- Status quo do nothing
- Endowment what I own is worth more
- Regret aversion avoid a decision that may turn out badly
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The next two lessons cover each bias in turn. For now, learn the map: five belief perseverance biases, four information-processing biases and six emotional biases.
Sort the cards into the two buckets, then check how the cognitive pile splits. If a card feels emotional but sits in the cognitive pile (mental accounting, anchoring), that is the exam trap this lesson is built to remove.
Moderate or adapt?
The reason to classify is the response. To moderate a bias is to recognize it and try to reduce or remove it in the person. To adapt to a bias is to recognize it, accept it and adjust the plan, instead of trying to change the person.
Exam tip Cognitive errors: fix the thinking. Emotional biases: work around the feeling.
Go deeper Bounded rationality: why people use shortcuts at all
Bounded rationality is the idea that people decide with limited information, limited time and limited processing capacity, so they use rules of thumb and settle for a good-enough answer instead of the best one. Many cognitive errors are shortcuts that work most of the time and fail in predictable ways. Behavioral finance does not throw traditional finance away. It adds a description of how real investors behave, and that description helps explain why some market patterns persist (the last lesson in this module).
Go deeper How much does it matter to the client?
In practice, an adviser also asks how much damage a bias can do. A bias that threatens the client’s ability to reach their goals is worth confronting. One that costs little can simply be accommodated. This is a judgment call, so the exam asks the simpler question: which type is it, and therefore moderate or adapt?
Memorize this
MemorizeCognitive errors vs emotional biases
| Cognitive error | Emotional bias | |
|---|---|---|
| Source | faulty reasoning: statistics, information processing, memory | feelings, impulse, intuition |
| Correctable? | yes, with information, education, advice | hard; arises without conscious effort |
| Response | moderate (reduce or remove the bias) | often adapt (accept it and adjust the plan) |
| Groups | belief perseverance (5), information processing (4) | one group of six |
Memory hook Head versus heart: thinking slips can be taught away; feelings must be worked around.
Know it cold Moderate = change the behavior. Adapt = accept the bias and build the portfolio around it. Many biases mix both; classify by the main driver.
MemorizeThe fifteen biases by name
| Family | Biases |
|---|---|
| Belief perseverance (5) | conservatism, confirmation, representativeness, illusion of control, hindsight |
| Information processing (4) | anchoring and adjustment, mental accounting, framing, availability |
| Emotional (6) | loss aversion, overconfidence, self-control, status quo, endowment, regret aversion |
Memory hook Count 5 + 4 + 6 = 15. The emotional initials (L, O, S, S, E, R) almost spell "loser", which is what they make of your returns.
Know it cold Overconfidence is classified as emotional, although it has a cognitive element. Mental accounting and anchoring feel emotional but are processing errors.
- Cognitive errors Memorize faulty reasoning; fix with information and education
- Belief perseverance Memorize cling to what we already believe
- Conservatismslow to update
- Confirmationseek agreeing evidence
- Representativenessjudge by resemblance
- Illusion of controlthink we steer outcomes
- Hindsight"I knew it all along"
- Information processing Memorize use facts and numbers illogically
- Anchoring and adjustmentstuck on a starting number
- Mental accountingmoney sorted into buckets
- Framingthe wording changes the answer
- Availabilityeasy to recall means likely
-
- Emotional biases Memorize feelings and impulses; hard to correct, so adapt
- Loss aversion losses hurt more than gains please
- Overconfidence unwarranted faith in own ability
- Self-control now beats later
- Status quo do nothing
- Endowment what I own is worth more
- Regret aversion avoid a decision that may turn out badly
-
How it is asked
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Which of these is an emotional bias?
Anchoring and adjustment, regret aversion or mental accounting?
Regret aversion. Trap: mental accounting, which feels emotional but is an information-processing error.
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Cognitive versus emotional correctability
Compared with emotional biases, cognitive errors are most likely:
Easier to correct with information and education. The other options describe emotional biases.
-
Moderate or adapt?
A client cannot bear to see losses despite repeated explanations, so the adviser lowers the risk of the portfolio.
Adapting to an emotional bias. Moderating would mean trying to change the client.
Exam traps
- Classifying overconfidence as a cognitive error. It has a cognitive element, but the curriculum groups it with the emotional biases.
- Calling emotional biases easy to correct. They stem from impulse and intuition, so the usual answer is to adapt.
- Swapping the verbs. To moderate is to reduce the bias in the person; to adapt is to accept it and adjust the portfolio.
- Treating mental accounting, framing or anchoring as emotional because they involve money and nerves. They are information-processing errors.
Checkpoint
3 exam-style questions. About 90 seconds each.
1Compared with emotional biases, cognitive errors are most likely:
2Which of the following is an emotional bias?
3An adviser builds a client's portfolio slightly more conservatively than the optimal one because the client cannot tolerate seeing losses, despite repeated explanations. The adviser is:
Key takeaways
- Cognitive errors come from faulty reasoning and are correctable: moderate them.
- Emotional biases come from feelings and are hard to correct: often adapt to them.
- Cognitive errors split into belief perseverance (5) and information processing (4); there are 6 emotional biases.
- Most biases mix both sources; classify by the dominant one.
All Portfolio Construction formulas, every lesson
Practice exam-style questions on The Behavioral Biases of Individuals
Questions about this lesson?
Where this comes back
- Cognitive errors: belief perseverance and information processing The Behavioral Biases of Individuals
- Emotional biases: loss aversion, overconfidence and four more The Behavioral Biases of Individuals
Questions candidates ask
What is the difference between cognitive errors and emotional biases?
Cognitive errors come from faulty reasoning: bad statistics, poor information processing or memory slips. Emotional biases come from feelings, impulse and intuition. Cognitive errors can often be corrected with better information and education. Emotional biases are harder to correct, so an adviser often adapts the portfolio to them.
Should an adviser moderate or adapt to a bias?
Moderate a cognitive error: reduce it with data, process and education. Adapt to an emotional bias: accept that the client will not change and build a portfolio the client can live with. Many biases mix both, so the choice also depends on how much damage the bias can do to the client's goals.
Is overconfidence a cognitive or emotional bias in the CFA curriculum?
Emotional. Overconfidence has both cognitive and emotional elements, but the curriculum classifies it as an emotional bias because it results mainly from emotion. It can still respond to better information, such as an honest review of trading records.
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