FIGURE 12.2 • The Genain Sisters’ Smooth Pursuit Eye Movements The Genain sisters completed this test in 1981. The results show that Nora and Hester had more irregularities in their eye movements, and they also performed more poorly on some of the neuropsychological tests, which indicates that they were more neurologically impaired.

Source: Courtesy of Dr. Deborah Levy, McLean Hospital, Belmont, MA.