The fact that language function is processed mainly by the left frontal cortex is a commonly recognized truth in modern science. However, back in the early nineteenth century, most scientists believed that language function was distributed throughout the brain rather than focused in one area. A patient who famously changed this view was Victor Leborgne, a Frenchman who was nicknamed "Tan" because that was the only sound he could create. In 1861, 51-year-old Leborgne came to the attention of the renowned neurologist Paul Broca, but died shortly afterward. Broca autopsied Leborgne's brain and noticed a lesion in his left frontal lobe. Considering Leborgne's limited speech but undamaged comprehension, Broca concluded that this area of the brain was responsible for speech production. He was able to convince his peers of this fact, an achievement now recognized as a key moment in psychology's history.
Which of the following statements BEST describes the underlined selections?