Executive Function and the Prefrontal Cortex

The brain's management system: inhibition, working memory and cognitive flexibility, how they're measured, how they develop, and what happens when the prefrontal cortex is damaged.

Executive functions are the processes that control and coordinate other mental abilities — the brain's management system. They let us pursue goals instead of reacting automatically.

Three core components

A widely used framework from Akira Miyake and colleagues (2000) identifies three core executive functions, related but separable. Inhibition: holding back a dominant response, resisting distraction or temptation (measured by the Stroop test or "go/no-go" tasks). Working memory updating: holding and manipulating information in mind. Cognitive flexibility (shifting): switching between tasks or rules, seeing things from a new angle. Higher-level abilities such as planning, reasoning and problem-solving build on these.

The prefrontal cortex

Executive functions rely heavily on the prefrontal cortex (PFC), working with the parietal cortex, basal ganglia and thalamus. The dorsolateral PFC is especially involved in working memory and planning; the anterior cingulate detects conflicts and errors; the inferior frontal gyrus, particularly on the right, helps stop actions; and the orbitofrontal and ventromedial regions handle value and social behaviour. Dopamine and noradrenaline tune PFC function — too little or too much impairs it.

Measuring it

In the Wisconsin Card Sorting Test, people sort cards by colour, shape or number, figuring out the rule from feedback — and then the rule secretly changes. Patients with frontal damage, as Brenda Milner showed in the 1960s, often keep sorting by the old rule even when told they're wrong (perseveration). The Tower of London puzzle tests planning.

Development and decline

Executive functions develop through childhood and adolescence, tracking prefrontal maturation, and tend to decline with age. Children's self-control has been linked in long-term studies to later health and income, though the famous "marshmallow test" findings have been partially revised by larger studies showing family background matters a great deal. Executive function difficulties are central to ADHD and occur after traumatic brain injury, in frontotemporal dementia and in many psychiatric conditions.