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They're not "brain patients" who happen to be "split"; they're patients whose brains are split. Hence this hyphen. |
→Movement and sensation: added homunculi image |
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===Movement and sensation===
[[Image:Sensory and motor homunculi.jpg|thumb|Sensory and motor homunculi at the London Natural History Museum]]
In the [[1940s]], [[Canada | Canadian]] [[neurosurgery | neurosurgeon]] [[Wilder Penfield]] and his [[neurologist]] colleague [[Herbert Jasper]] developed a technique of brain mapping to help reduce [[Adverse effect (medicine) | side effect]]s caused by [[surgery]] to treat [[epilepsy]]. They stimulated [[motor cortex | motor]] and [[somatosensory cortex | somatosensory cortices]] of the brain with small electrical currents to activate discrete brain regions. They found that stimulation of one hemisphere's motor cortex could produce [[muscle]] contraction on the opposite side of the body. Furthermore, the functional map of the motor and [[Somatosensory system|sensory]] cortices is fairly consistent from person to person; Penfield and Jasper's famous pictures of the motor and sensory [[homunculus|homunculi]] were the result.
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