Reflex epilepsy helped demonstrate that seizures can be triggered by highly specific sensory or cognitive events. One striking mid-twentieth-century case linked neurologist Francis Forster with Wilder Penfield and helped shape a career devoted to stimulus-provoked seizures.
What is reflex epilepsy?
In reflex epilepsies, seizures are consistently triggered by a particular stimulus or activity. Triggers can include flashing light, reading, thinking, touch, sound or other highly specific inputs.
Forster’s 1946 observation
Francis Forster became interested in reflex epilepsy after observing a four-year-old girl in 1946 whose seizures could be provoked by somatosensory stimulation. Medical treatment did not control the events.
A journey to Montreal
Forster recommended surgery and facilitated transfer to Wilder Penfield at the Montreal Neurological Institute. He travelled to Montreal for the child’s operation on 27 February 1948; historical review describes the surgery as curative.
Why the case mattered
Forster’s contact with Penfield and Herbert Jasper strongly influenced his later work. The case sat at the intersection of careful clinical observation, reproducible triggering, cortical localisation and surgery.
A history that still matters
A reproducible trigger can provide genuine mechanistic information, but it does not mean the trigger itself caused the person’s epilepsy. That distinction remains important today.
Related reading
Sources and further reading
Evidence checked: September 2026.