→Movement and sensation: edit to this wonderful paragraph about Jasper and Penfield's monolithic contributions; lateralization was already well established by then
In the [[1940s]], [[Canada | Canadian]] [[neurosurgery | neurosurgeon]] [[Wilder Penfield]] and his [[neurologist]] colleague [[Herbert Jasper]] developed a technique of brain mapping out to help reduce [[Adverse effect (medicine) | side effect]]s caused by [[surgery]] to treat [[epilepsy]]. Todo this, heThey stimulated the [[motor cortex | motor]] and [[somatosensory cortex | somatosensory cortices]] of the brain with small electrical currents to activate discrete brain regions. He They found that,bystimulation stimulatingof one hemisphere of the's motor cortex he could elicit aproduce [[muscle]] contraction on the opposite side of the body. Indeed Furthermore, the entirefunctional right sidemap of the body'smotor musculature, as well asand [[Somatosensory system| sensationsensory]] ofcortices [[pain]]is fairly consistent from person to person; Penfield and [[touch]],Jasper's isfamous locatedpictures inof the left hemispheremotor and vicesensory [[homunculus]]es were the versaresult.
