Dwell Time and Movement Time
Figure 4A shows the mean dwell times (±1 SE) and mean movement times (±1 SE) as a function of driving period. An ANOVA concerning the effect of driving period on dwell time revealed a main effect, F(1.25, 8.72) = 18.79, p <.01, such that dwell time increased as driving period lengthened. The lengthening of dwell time had an approximately exponential time course, suggesting gradual rather than discontinuous change.
For movement time, the ANOVA revealed a main effect of driving period, F(1.22, 8.55) = 23.03, p <.01, so that movement time increased as driving period lengthened. The lengthening of movement time with driving period approximated an exponential function, again indicating gradual instead of discontinuous change across the range of driving periods.
To test for rate scaling, we calculated proportional dwell times by dividing the total dwell time by the sum of dwell and movement time. Figure 4B shows the mean proportional dwell time as a function of driving period. The ANOVA revealed a main effect of driving period on proportional dwell time, F(1.62, 11.37) = 7.73, p = .01. Proportional dwell time tended to increase with increasing driving periods, especially for the two longest driving periods. Again, the function relating proportional dwell time to driving period was monotonic without clear discontinuous changes.
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