Psychology › Brain & biology › Brain regions and localization of function
Prefrontal cortex: planning and self-control
· Concept
Well replicatedStrong, repeated evidence.
The front of the brain, behind the forehead, that plans, holds goals in mind and restrains impulses.
See it on the Psychology map →What it says
The prefrontal cortex runs 'executive functions': planning, working memory (holding a few items in mind), switching tasks, weighing future consequences and overriding urges. It connects to nearly every other brain area, including emotional centers like the amygdala, which it helps calm. It is among the last regions to mature, still refining its wiring into the twenties. Damage from injury, stroke or the old lobotomy operation can leave intelligence intact while wrecking judgment, planning and social behavior.
Why it matters
It underlies self-control and long-range decisions, and its slow maturation helps explain teenage risk-taking. Sleep loss, stress and alcohol all impair its functions, which is one reason tired decisions are worse.
The evidence
Status: well replicated. Lesion cases, brain imaging, animal studies and repeated scans of developing brains all point to its executive role.
Open questions
How its subregions divide the work, and whether self-control relies on it alone or on wider brain networks, is actively researched.
Inside this (1)
Connections (5)
▸Prefrontal cortex: planning and self-control matures last among Brain regions and localization of functionWell replicated
The connection
The brain matures roughly back to front: sensory and movement areas first, prefrontal areas last. Unused connections are pruned and wiring is insulated (myelinated) into the twenties, which helps explain why teenagers can reason well yet take impulsive risks, especially with peers around.
Who showed it and when
Long-term MRI studies at the US National Institute of Mental Health led by Jay Giedd, scanning children repeatedly from the 1990s; a key paper appeared in 2004.
The evidence
Repeated scans of the same children over about a decade, confirmed by larger later studies, show this back-to-front sequence.
Open questions
The popular 'brain matures at 25' line is a simplification: development varies by person and continues past 25, and how much brain timing explains teen behavior is debated.
▸Prefrontal cortex: planning and self-control supports Self-control and willpowerWell replicated
The connection
The prefrontal cortex holds long-term goals in mind and dampens signals from reward and emotion circuits. In a 2009 study of dieters choosing foods, those who picked healthy options showed a side region of the prefrontal cortex shifting the brain's value signals toward health. Its slow maturation into the mid-twenties helps explain why teenagers act more impulsively.
Who showed it and when
Todd Hare, Colin Camerer and Antonio Rangel at Caltech, 2009; Bernd Figner and colleagues' brain-stimulation study, 2010.
The evidence
Imaging, lesion cases and magnetic stimulation: temporarily disrupting the left lateral prefrontal cortex made people choose smaller, sooner rewards more often.
Open questions
Whether self-control is a single prefrontal 'brake' or emerges from wider networks, and how much everyday self-control is avoiding temptation rather than resisting it.
▸Prefrontal cortex: planning and self-control is still maturing in Adolescence and the teenage brainWell replicated
The connection
The prefrontal cortex, which handles planning and impulse control, is among the last brain regions to mature: unused connections are pruned and the rest insulated with myelin into the twenties. Meanwhile reward circuits surge at puberty. The mismatch helps explain why teens take more risks, especially with peers watching, even when they know the dangers.
Who showed it and when
Shown by NIH brain-imaging studies led by Jay Giedd from the 1990s; Laurence Steinberg at Temple University built the 'dual systems' model in the 2000s.
The evidence
Repeated MRI scans of the same youths over years show prefrontal changes into the mid-twenties; lab tasks show peers raise risk-taking in teens far more than in adults.
Open questions
How directly brain-scan changes cause behavior; calm teens reason about as well as adults, and culture and opportunity shape risk-taking too.
▸Phineas Gage's iron-rod brain injury first hinted at the role of Prefrontal cortex: planning and self-controlMixed evidence
The connection
Gage kept his speech, memory and intelligence but reportedly lost judgment and self-restraint after the rod destroyed much of his left frontal lobe. That pattern suggested the front of the brain governs planning and social conduct, an idea textbooks repeated for a century before modern patients and brain imaging confirmed it.
Who showed it and when
Cavendish, Vermont, 1848; Dr. John Harlow's reports of 1848 and 1868; Hanna and Antonio Damasio's skull reconstruction, published in 1994.
How solid is it?
The preserved skull fixes the injury's path, and modern patients with similar frontal damage show similar changes, supporting the link Harlow described.
Open questions
Harlow's account is brief and partly written 20 years later; whether the rod also damaged the right side, and how much Gage recovered, are disputed.
▸Lobotomy severed connections to Prefrontal cortex: planning and self-controlWell replicated
The connection
Surgeons cut or scraped the white-matter fibers linking the prefrontal cortex to deeper brain regions, on the theory that fixed, abnormal circuits caused mental illness. Severing them often reduced agitation but also damaged planning, initiative and emotional depth, the very functions the prefrontal cortex supports.
Who showed it and when
Lisbon, 1935 (Moniz and surgeon Pedro Almeida Lima); Washington, D.C., from 1936 (Walter Freeman and James Watts); Freeman's eye-socket method from 1946.
The evidence
Surgical descriptions, autopsies and follow-up studies documented both the cut fibers and the resulting blunting of judgment and motivation.
Open questions
Why some patients seemed to benefit while others were devastated is unclear, because early results were rarely compared with untreated patients.