Figure 1.

Two real data cases are plotted to illustrate the PR score significance. In the first (left) plot, the saccadic eye responses appear mainly on a narrow interval of time; in this gathered plot, the computed PR score has a low value (PR score = 8). In the second (right plot), the saccadic eye responses appear on a wide interval of time; even in some cases, the first responses appear after the second responses registered on other impulses; in this scattered plot, the computed PR score is much higher (PR score = 68). “X” mark is for the first group of detected saccades, “*” mark is for the second detected group, and “+” mark is for the third detected group. Y axis is head and eye velocity in degree per second, and X axis is the time domain measured in samples (at an approximated sampling frequency of 250 frames per second). Both plots and PR score measurements were obtained using the open source software HITCal 4.0 (www.mlibra.com).