Table 3.

Saccadic eye-movement variability in pro- and anti-saccade task

PD patientsControlsTwo-sample unpaired t tests
Pro-saccades
    Amplitude (deg)
Velocity (deg/s)
Latency (ms)		3.3 ± 1.5
72 ± 34
106 ± 35		0.8 ± 0.4
29 ± 21
55 ± 21		t(16.9) = 6.45; p < 0.001; d = 2.27a
t(24.4) = 4.40; p < 0.001; d = 1.53a
t(24.3) = 5.14; p < 0.001; d = 1.79a
Anti-saccades
    Amplitudeb (deg)
Velocityb (deg/s)
Latency (ms)		3.1 ± 2.0
66 ± 44
115 ± 29		1.5 ± 1.2
30 ± 19
73 ± 26		t(23.8) = 2.83; p = 0.009; d = 0.99a
t(19.8) = 3.01; p = 0.007; d = 1.06a
t(30.5) = 4.45; p < 0.001; d = 1.53a

  • ↵aSignificant results.

  • ↵bOnly trials in which participants made a saccade into the correct (uncued) direction are included.