further developed the theory of the specialization of specific brain structures in language comprehension and production. Richard Caton presented his findings in 1875 about electrical phenomena of the cerebral hemispheres of rabbits and monkeys. In 1878, Hermann Munk found in dogs and monkeys that vision was localized in the occipital cortical area, David Ferrier found in 1881 that audition was localized in the superior temporal gyrus and Harvey Cushing found in 1909 that the sense of touch was localized in the postcentral gyrus. Modern research still uses the Korbinian Brodmann's cytoarchitectonic (referring to study of cell structure) anatomical definitions from this era in continuing to show that distinct areas of the cortex are activated in the execution of specific tasks. Studies of the brain became more sophisticated after the invention of the microscope and the development of a staining procedure by Camillo Golgi during the late 1890s that used a silver chromate salt to reveal the intricate structures of single neurons. His technique was used by Santiago Ramón y Cajal and led to the formation of the neuron doctrine, the hypothesis that the functional unit of the brain is the neuron. Golgi and Ramón y Cajal shared the Nobel Prize in Physiology or Medicine in 1906 for their extensive observations, descriptions and categorizations of neurons throughout the brain. The hypotheses of the neuron doctrine were supported by experiments following Galvani's pioneering work in the electrical excitability of muscles and neurons. In 1898, British scientist John Newport Langley first coined the term "autonomic" in classifying the connections of nerve fibers to peripheral nerve cells. Langley is known as one of the fathers of the chemical receptor theory, and as the origin of the concept of "receptive substance". Towards the end of the nineteenth century Francis Gotch conducted several experiments on nervous system function. In 1899 he described the "inexcitable" or "refractory phase" that takes place between nerve impulses. His primary focus was on how nerve interaction affected the muscles and eyes. Heinrich Obersteiner in 1887 founded the ‘‘Institute for Anatomy and Physiology of the CNS’’, later called Neurological or Obersteiner Institute of the Vienna University School of Medicine. It was one of the first brain research institutions in the world. He studied the cerebellar cortex, described the Redlich–Obersteiner's zone and wrote one of the first books on neuroanatomy in 1888. Róbert Bárány, who worked on the physiology and pathology of the