Table 4.

Eye movement accuracy during sinusoidal pursuit and track-intercept task

PD patientsControlsTwo-sample unpaired t tests
Sinusoidal pursuit
    Eye velocity gain
Position error (deg)
Saccade rate (sac/s)
1.08 ± 0.23
2.2 ± 1.0
4.6 ± 1.1
1.01 ± 0.21
1.9 ± 0.7
4.0 ± 0.7
t(30.5) = 0.87; p = 0.39; d = 0.30
t(25.4) = 0.79; p = 0.44; d = 0.27
t(24.4) = 2.05; p = 0.05; d = 0.71a
Track-intercept
    Pursuit latency (ms)
Initial eye velocity
    (deg/s)
Position error (deg)
Saccade latency (ms)
88 ± 48
5.8 ± 1.6
1.3 ± 0.3
275 ± 32
49 ± 51
6.1 ± 1.6
1.2 ± 0.3
241 ± 26
t(26.8) = 2.14; p = 0.04; d = 0.79a
t(27.2) = 0.46; p = 0.65; d = 0.17
t(26.1) = 1.47; p = 0.15; d = 0.54
t(27.9) = 3.18; p = 0.004; d = 1.16a
  • aSignificant results.