Appendix 3
Percentage Change in Reaction Time Based on Different Individual Curves
The following three figures show the percentage change in mean reaction time for the red, yellow and
green LED signals calculated from the best fitting curves through the mean reaction times, the mean
reaction times plus one standard deviation and the mean reaction times minus one standard deviation for
each individual subject (see Appendix 1 for the curves). For the red LED signal, 100% reaction time is
at a luminance of 5000 cd/m2. For the yellow LED signal, 100% reaction time is at a luminance of
23,121 cd/m2. For the green LED signal, 100% reaction time is at a luminance of 10,000 cd/m2. The
fact that the percentage changes are very similar for all three curves, for the same signal color, indicates
the predictive equations for percentage change in reaction time are robust.
A3-1