Does Anger Make You Overestimate Your Intelligence? The Research Explained

Does a quick temper make people overestimate their intelligence? A 2018 study found an association between the tendency to experience anger and more favorable self-ratings of intelligence relative to measured performance. That does not mean angry people are unintelligent, that anger reduces IQ, or that every frequently angry person is narcissistic. The important distinction is between what someone believes about their ability and what independent tasks actually measure.

The original Horus Valley article summarized research published in 2018. This updated guide examines the foundational findings alongside subsequent work on risk perception, anger and decision-making, self-assessment bias, and emotional self-awareness through November 2026. It also offers a practical way to test whether your confidence is supported by evidence.

What did the 2018 study actually find?

In the journal Intelligence, researchers Marcin Zajenkowski and Gilles E. Gignac published “Why do angry people overestimate their intelligence?” Their two studies involved approximately 528 participants overall, principally university students. Participants completed measures of dispositional anger and related personality traits, rated their own intelligence, and performed cognitive tests. Read the original research paper and the University of Western Australia’s account of the study.

Higher trait anger was associated with relatively higher subjectively assessed intelligence, including after statistically accounting for measured cognitive ability. Personality variables such as neuroticism and narcissistic traits helped describe the pattern. Crucially, this was not evidence that anger causes low intelligence, nor did it justify diagnosing any participant with narcissistic personality disorder.

Trait anger is not the same as feeling angry once

Trait anger refers to a relatively stable tendency to experience anger across situations. State anger refers to an emotional response at a particular moment. The 2018 study primarily examined trait anger, so its findings cannot be casually converted into the claim that anyone who becomes angry during one argument immediately inflates their IQ estimate.

Why might anger be linked to overconfidence?

1. A stronger sense of certainty and control

Anger can be accompanied by the feeling that the situation is easy to explain and that someone is responsible for what happened. That feeling of certainty may carry over into unrelated judgments. Classic experiments by Jennifer Lerner and Dacher Keltner found that anger and fear were linked to different perceptions of risk: anger tended to accompany more optimistic estimates while fear tended to accompany more cautious estimates. These experiments addressed risk judgment, not IQ. Source: Fear, Anger, and Risk (2001).

2. Feeling certain is not the same as being correct

You can be confident and accurate, confident and mistaken, uncertain and correct, or uncertain and mistaken. An overestimation exists when confidence exceeds what verified results support. Judging confidence alone cannot tell us whether someone is intelligent or capable.

3. Personality factors and context

The researchers examined associations with measured narcissistic traits and neuroticism. These are statistical personality constructs and should not be confused with clinical diagnoses. The use of university-student samples also means the results cannot automatically be generalized to every age group, occupation, country, or culture.

Does having a short temper mean someone has a lower IQ?

No reliable general rule supports that conclusion. The studies addressed the alignment between self-ratings and performance. A person who becomes angry often can still perform exceptionally well on cognitive tasks, and a calm person can still overrate their own abilities. Anger is not an individual intelligence test.

Nor is this finding simply another name for the Dunning–Kruger effect. That term covers patterns of self-evaluation relative to competence; the anger research tested an emotional disposition and its association with estimates of intelligence. The topics overlap in self-assessment but involve different questions and methods.

What do newer studies add?

A 2024 paper in the Journal of Behavioral Decision Making reported two preregistered experiments in which participants recalled anger- or fear-related events from either a self-immersed or self-distanced perspective. Angry participants who focused closely on the upsetting event were slower to avoid disadvantageous choices in an uncertainty task. Taking a more detached perspective appeared to moderate that carryover. The findings concern decision-making under uncertainty rather than raw intelligence. Source: the original 2024 study.

A March 2025 study in BMC Psychology examined 35 adults performing short-term memory tasks while researchers analyzed facial expressions under different stimulus conditions. It identified associations between self-assessment bias and anger or hostility-related expressions. The small sample and task-specific design make it inappropriate to infer that facial appearance reveals IQ, dishonesty, or a mental health condition. Source: the 2025 paper.

On November 4, 2026, an early online research article reported initial development and validation of an Anger Meta-Awareness Scale using two Australian samples of 292 and 304 adults. It explored links between recognizing and regulating anger and other emotional outcomes. It did not measure intelligence or establish that self-awareness automatically improves IQ. The paper was posted as an early version pending final production edits. Source: the 2026 BMC Psychology study.

Practical example: test confidence against evidence

Imagine confidently predicting that a project will take four hours. You give that prediction 90% confidence, yet the completed project takes eight hours. The difference does not show that you lack intelligence; it shows that your confidence was poorly calibrated for this task. You can repeat the same test with estimates, forecasts, or answers that have verifiable outcomes.

1. Write down your prediction before you see the outcome, together with a confidence estimate.
2. List two pieces of evidence supporting it and at least one fact that would change your mind.
3. Compare your original estimate with the actual result without rewriting the prediction afterward.
4. Ask for concrete feedback on the task rather than a sweeping judgment about your intelligence.
5. Repeat across several decisions; one inaccurate prediction does not establish a personality pattern.

Five ways to make better decisions when angry

1. Delay nonurgent high-stakes decisions. If possible, avoid making financial, relationship, or work decisions at peak anger.
2. Label the emotion. Recognize that you are angry without treating your explanation of events as automatically correct.
3. Use self-distancing. Ask how an impartial observer would describe the facts rather than repeatedly replaying the offense.
4. Check objective evidence. Compare your claim of competence or certainty with observable outcomes.
5. Invite specific feedback. Seek a second perspective on measurable issues instead of escalating a personal argument.

If recurrent anger causes threats, aggression, or persistent problems in relationships or work, speaking with a qualified mental-health professional may help. Anger alone is not a diagnosis. Prioritize safety and appropriate support when there is an immediate threat.

Can you use this research to judge someone you know?

No. Raised voices, irritation, confident statements, and defensive arguments cannot establish a person’s IQ or personality disorder. A more useful response is to discuss verifiable behavior, factual mistakes, and respectful boundaries rather than labeling someone a narcissist or assuming they lack intelligence.

Frequently asked questions

Does anger make people overconfident?

It may be linked to greater certainty or control in some contexts, but not every angry person becomes overconfident and not every confident judgment is inaccurate.

Do quick-tempered people overestimate their intelligence?

A 2018 study found a statistical tendency in specific research samples. That is not enough to judge any individual or to claim the relationship applies universally.

Is anger a sign of narcissism?

No. Research on narcissistic personality traits is not equivalent to diagnosing a personality disorder. Such a diagnosis requires appropriate clinical assessment.

Does anger lower IQ?

These studies do not establish that an angry disposition reduces IQ. They distinguish objective test performance from self-estimates of ability.

How can I stop overestimating my abilities when upset?

Pause before making a consequential choice, consider an outsider’s perspective, seek evidence that challenges your interpretation, and review predictions against actual outcomes. These are decision-quality strategies, not a diagnostic test.

Bottom line

Trait anger may be associated with inflated self-assessments of intelligence in some groups, and anger can alter how people perceive certainty and risk. Neither finding proves that angry people are less intelligent or clinically narcissistic. The practical lesson is to distinguish confidence from evidence and to check judgments carefully, especially when emotions are running high.

Primary research and further reading

• Zajenkowski & Gignac (2018), Intelligence — the original trait-anger and self-assessed intelligence study.
• University of Western Australia (2018) — institutional research summary.
• Lerner & Keltner (2001) — Fear, Anger, and Risk.
• Mayiwar and colleagues (2024) — self-distancing and anger during uncertain decisions.
• Kasek and colleagues (2025) — self-assessment bias and emotional expressions in a small adult sample.
• Love & Armstrong (2026) — initial validation of an anger meta-awareness scale.

Related reading on Horus Valley

Explore why aggression can escalate on the road, the Flynn effect and IQ score trends, and why uncertainty may feel worse than bad news.