Executive Function: What It Is and How It’s Assessed

Executive function is the brain’s management system: the set of skills you use to plan a project, stop yourself from blurting something out, keep track of what you were doing, and change course when a plan fails. When people say they are “disorganized,” “always late” or “can’t get started,” they are often describing executive function. It can be assessed with questionnaires about daily life, with performance tasks, or both, and understanding the difference helps you make sense of any result you get.

The core executive skills

Adele Diamond’s influential review describes three core executive functions that more complex abilities build on:

• Inhibition: resisting an automatic or tempting response, and filtering out distractions so you can stay on task.
• Working memory: holding information in mind while you use it. Our working memory guide covers this one in detail.
• Cognitive flexibility: changing perspective or approach, adjusting to new rules or priorities, and switching between tasks. Diamond calls it the opposite of rigidity.

Planning, problem-solving and reasoning draw on all three. That is why researchers include planning tasks in executive function batteries, and why an executive problem can show up in very different ways from person to person.

What executive dysfunction looks like in real life

• Knowing exactly what needs doing but being unable to start.
• Underestimating how long things take, again and again.
• Losing track of multi-step tasks once interrupted.
• Acting or speaking before thinking, then regretting it.
• Getting stuck on one approach even when it clearly is not working.
• Relying on urgency and deadlines to get anything done.

Many capable adults recognize themselves here. Our article on ADHD in high-performing adults describes how people compensate for years before the cost catches up with them.

Two ways to assess it: ratings and performance tasks

There is no single executive function test. Clinicians and researchers use two broad approaches:

A practitioner review by Toplak and colleagues (2013) looked at 20 studies that used both. Only 24% of 286 correlations between the two kinds of measure were statistically significant, with a median correlation of just .19. The authors concluded that ratings and tasks capture different things: tasks reflect the efficiency of cognitive abilities, ratings reflect success in pursuing goals in everyday life. Neither is “the real” measure. Together they give a fuller picture.

When ratings and tasks disagree

A common pattern is someone who rates their daily executive problems as severe yet scores in the typical range on every task. That does not mean they are exaggerating. A short, quiet, novel test session with clear rules is exactly the kind of setting where many people with executive difficulties do well; the trouble comes with open-ended days, competing demands and boring tasks with distant deadlines. The opposite pattern also happens: low task scores in someone who feels fine, which may reflect a bad night, test anxiety or a skill they compensate for well. In both cases the mismatch is information, and it is the clinician’s job to explain it rather than pick a winner.

Questionnaires such as the BRIEF

The best-known executive function rating scale is the Behavior Rating Inventory of Executive Function (BRIEF), which has versions for children (completed by parents and teachers) and an adult self-report form, the BRIEF-A. It asks about everyday behaviors rather than test performance. Its items are copyrighted, so we describe rather than reproduce them.

In a study of 1,090 adults referred to a specialty clinic for ADHD (Biederman and colleagues, 2022), 44% scored in the range the authors classified as executive dysfunction on the BRIEF-A. They described this as “a sizeable minority” of adults with ADHD, and those adults had more severe symptoms and lower quality of life. Put the other way, more than half did not score in that range, another reminder that ADHD and executive dysfunction overlap rather than coincide.

Performance tasks and what each one targets

Performance tasks are built to stress one skill at a time:

• Inhibition: Stroop-type tasks, where you name a word’s ink color while ignoring what the word says, and go/no-go or stop-signal tasks, where you must hold back a response on cue. Diamond lists these among standard inhibition measures.
• Planning: tower puzzles, where you rearrange pieces to match a goal in as few moves as possible, thinking ahead before you act.
• Working memory: backward span and spatial sequence tasks.
• Flexibility: task-switching tests in which the sorting rule changes without warning.

In the Creyos battery described in our Creyos patient guide, Spatial Planning is a Tower of London-like planning task with a three-minute limit, Double Trouble is a Stroop-like measure of response inhibition with a 90-second limit, Token Search measures working memory, and Odd One Out measures deductive reasoning. The task-by-task explainer describes each.

Executive function and ADHD

ADHD is closely tied to executive function in the research literature, but not in a one-to-one way. Willcutt and colleagues’ 2005 meta-analysis of 83 studies found that groups with ADHD showed weaknesses on every executive measure tested, with medium effect sizes; the strongest and most consistent effects were for response inhibition, vigilance, working memory and planning.

The same authors concluded that because the effects were moderate and not found in everyone, executive weaknesses are “neither necessary nor sufficient” to cause all cases of ADHD. A person can have ADHD with typical task scores, and a person can score poorly on executive tasks for reasons that have nothing to do with ADHD. That is why tasks and questionnaires inform an ADHD evaluation rather than replace it. Our page on Creyos in an ADHD assessment explains how the two are combined.

Stress, depression and sleep can mimic executive problems

Diamond’s review makes a point worth repeating: executive functions are among the first skills to suffer when something is off in your life. Stress, sadness, loneliness, sleep deprivation and low physical fitness all impair them, and she notes that any of these can make someone appear to have an executive disorder such as ADHD when they do not.

Depression is a clear example. Snyder’s 2013 meta-analysis of 113 studies found that major depression is reliably associated with weaker performance across executive measures, with effect sizes from 0.32 to 0.97. A thorough evaluation therefore looks at mood, sleep and stress before concluding that a low executive score reflects a lifelong pattern.

What about online executive function quizzes?

Quick online “executive dysfunction quizzes” can be a useful prompt for reflection, but most are not standardized, have no published norms and cannot separate executive problems from anxiety, low mood or a stressful month. Treat a high score as a reason to talk to someone, not as an answer. Our guide to free online cognitive tests explains what to look for.

Strategies and next steps

Executive weaknesses respond well to structure placed outside your head: visible calendars, timers, checklists, breaking projects into first steps, and body-doubling. Our roundup of organization tools for adults with ADHD is a practical place to start.

If problems are long-standing and affecting work, school or relationships, an evaluation can sort out ADHD, mood, sleep and other contributors. At Willow & Stone, a Creyos assessment may be part of that; ask our team how it is given and what it costs, or request a consultation.

Common Questions

Sources & Further Reading

• Diamond A. Executive functions. Annu Rev Psychol. 2013
• Toplak ME, West RF, Stanovich KE. Do performance-based measures and ratings of executive function assess the same construct? J Child Psychol Psychiatry. 2013
• Biederman J et al. Toward operationalizing executive function deficits in adults with ADHD using the BRIEF-A. J Clin Psychiatry. 2022
• Willcutt EG et al. Validity of the executive function theory of ADHD: a meta-analytic review. Biol Psychiatry. 2005
• Snyder HR. Major depressive disorder and neuropsychological measures of executive function. Psychol Bull. 2013
• Creyos — Report Interpretation Guide (PDF)

This article is general education, not a diagnosis or advice for your situation. Creyos results support, and never replace, a clinical evaluation; only a clinician who has evaluated you can diagnose a condition or recommend treatment. Do not start, stop, or change a medication without talking to the clinician who prescribes it.