Phineas Gage: The Iron Rod Case That Changed Neuroscience

On September 13, 1848, **Phineas Gage**, a 25-year-old railroad foreman, survived a tamping iron (3'7", 13.25 lbs, 1.25" diameter) blasted through his left frontal lobe.

The Accident

• Explosion drove rod through left cheek, behind left eye, out top of skull.
• Land 80 ft away; Gage walked, talked, rode to doctor.
• Dr. Harlow treated: removed bone fragments, dressed wound. Survived infection.

Personality Transformation

• Pre-injury: Capable, efficient, well-liked, responsible.
• Post-injury: "Fitful, irreverent, profane, impatient, obstinate, capricious" — Harlow.
• Lost job, wandered, worked in Chile as stagecoach driver, died 1860 (seizures).

Neuroscientific Impact

• First clear evidence: **Frontal lobes govern personality, decision-making, social behavior.**
• Modern CT of skull (2004): Damage to left prefrontal cortex, orbital/medial regions; white matter tracts (uncinate fasciculus) disrupted bilaterally.
• Founded field of **neuropsychology** and **social neuroscience**.

Legacy

Gage's case disproved phrenology's simplistic localization and established that **specific brain regions subserve higher cognitive/emotional functions**. His skull and rod are at Harvard's Warren Anatomical Museum.