Psychology › Brain & biology › Prefrontal cortex: planning and self-control
Phineas Gage's iron-rod brain injury
1848· Finding or experiment
Mixed evidenceSome support; effects smaller or less consistent than once thought.
In 1848 an iron rod shot through a railroad foreman's skull; he survived, but his personality reportedly changed.
See it on the Psychology map →What it says
Gage, 25, was blasting rock for a Vermont railroad when his 13-pound, 43-inch tamping iron struck a spark, ignited the powder and was driven in under his left cheekbone and out the top of his head. He spoke within minutes and recovered physically. His doctor, John Harlow, later reported that the capable, well-liked foreman became impatient, profane and unable to stick to plans: 'no longer Gage'. He later drove stagecoaches in Chile for years and died in San Francisco in 1860.
Why it matters
It became the classic case linking the frontal lobes to personality and self-control, helping establish that specific brain areas do specific jobs.
The evidence
Status: mixed. Harlow's reports (1848, 1868) are thin, and later textbooks embellished them. His skull and the iron are at Harvard's Warren Anatomical Museum; two photographs of him surfaced in 2009–2010.
Open questions
How much he changed, and for how long: historian Malcolm Macmillan argues his stagecoach years show substantial social recovery, itself a lesson in the brain's ability to adapt.
Connections (2)
▸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.
▸Phineas Gage's iron-rod brain injury suggested brain damage can erode Self-control and willpowerMixed evidence
The connection
Harlow's 1868 report described Gage after the injury as 'impatient of restraint or advice when it conflicts with his desires' and unable to stick to plans, while his memory and intellect seemed intact. That contrast, restraint lost but reasoning kept, made him the founding case for the idea that frontal brain areas support self-control.
Who showed it and when
Accident near Cavendish, Vermont, 1848; John Harlow's report, 1868; Hanna and Antonio Damasio's 1994 skull reconstruction and his book Descartes' Error.
How solid is it?
Harlow's notes and the preserved skull. Direct evidence of the personality change is thin, but modern patients with similar damage show the pattern far more reliably.
Open questions
How much, and for how long, Gage changed; his later years as a stagecoach driver in Chile suggest a substantial recovery that textbooks often omit.