In 1861, Broca visited a patient, named Louis Victor Leborgne in the Bicêtre Hospital, who had a 21-year progressive loss of speech and paralysis but not a loss of comprehension nor mental function. He was nicknamed "Tan" due to his inability to clearly speak any words other than "tan" (pronounced \tɑ̃\, as in the French word « temps », "time"). Leborgne died several days later due to an uncontrolled infection and resultant gangrene, Broca performed an autopsy, hoping to find a physical explanation for Leborgne's disability. He determined that, as predicted, Leborgne did in fact have a lesion in the frontal lobe in one of the cerebral hemispheres, which in this case turned out to be the left. From a comparative progression of Leborgne's loss of speech and motor movement, the area of the brain important for speech production was determined to lie within the third convolution of the left frontal lobe, next to the lateral sulcus. One day after Tan's death Broca presented his findings to the anthropological society.