Sir David Ferrier FRS (13 January 1843 – 19 March 1928) was a pioneering Scottish neurologist and psychologist.
The primary motor cortex in the posterior frontal lobe (Brodmann area 4) was first described by David Ferrier in 1874, who used electrical stimulation to map the cortical areas responsible for movement in monkeys 1).
1) Ferrier D. Experiments on the brain of monkeys – No. I. Proc R Soc Lond. 1874;23:409–30.