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Research Békésy developed a method for dissecting the inner ear of human cadavers while leaving the cochlea partly intact. By using strobe photography and silver flakes as a marker, he was able to observe that the basilar membrane moves like a surface wave when stimulated by sound. Because of the structure of the cochlea and the basilar membrane, different frequencies of sound cause the maximum amplitudes of the waves to occur at different places on the basilar membrane along the coil of the cochlea. He concluded that his observations showed how different sound wave frequencies are locally dispersed before exciting different nerve fibers that lead from the cochlea to the brain. He theorized that the placement of each sensory cell (hair cell) along the coil of the cochlea corresponds to a specific frequency of sound (the so-called "topography"). Békésy later developed a mechanical model of the cochlea, which confirmed the concept of frequency dispersion by the basilar membrane in the mammalian cochlea. But, of course, this model could not provide any information as to a possible function of this frequency dispersion in the process of hearing. Later research, then, showed that frequency dispersion in hearing also occurs when the basilar membrane is immobilized due to certain inner ear diseases*. Therefore one had to conclude that also mammals, like all other land vertebrates, have their frequency selectivity in hearing on the basis of intrinsically tuned hair cells. Biography Békésy was born in Budapest, Hungary, the son of diplomat Alexander von Békésy and his wife Paula. He went to school in Budapest, Istanbul, Munich, and Zürich. He studied chemistry in Berne and received his PhD from the University of Budapest in 1926. During World War II, Békésy worked for the Hungarian Post Office, where he did research on telecommunications. This research led him to become interested in the workings of the ear. In 1946, he left Hungary to follow this line of research at the Karolinska Institute in Sweden. In 1947, he moved to the United States, working at Harvard until 1966. He became a professor at the University of Hawaii in 1966 and died in Honolulu. | ||||||||||
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