The development of symmetrical optokinetic nystagmus during infancy

1. We examined the monocular optokinetic nystagmus (OKN) of normal 2-, 3-, and 6-month-olds and adults (n = 20 per group) for large (9°) stripes. 2. During seventy-eight 7-s trials, each subject was shown either a blank field or black-and-white vertical stripes moving horizontally across an 84 x 84° screen. 3. The results were similar for the two velocities of square-wave gratings (13 and 24°/s), and for the three measures of OKN: presence vs …