Trials of this third type allowed us to quantify the size of the Aubert-Fleischl phenomenon because they determined the relative difference in perceived speed between fixated and pursued stimuli.
As a matter of fact, two (populations of) worms with well defined velocity (Fig. 5a) are separable if the length of the gel is longer than δ vmax/Δv, where Δv is the relative difference of their average speed, vmax the velocity of the fastest worm and δ the typical size on which worms are captured afterwards.
aRegression models evaluated the mean difference in maximum grip strength and usual walking speed and the relative difference in chair stand time per year of advancing age.
Pink dotted lines: they correspond to the relative difference of the results between the interpolation factors I=3 and I=1 (actual speeds).
Motion only exists as a "relative difference" among bodies: that is, the bodies do not possess individual, determinate properties of speed, velocity, acceleration (e.g., body C has the speed property of "5 miles per hour"); rather, all that really exists is a difference in their relative speed, velocity, and acceleration (e.g., there is a speed difference among bodies C and B of "5 miles per hour").
Green dashed lines: they correspond to the relative difference between the results obtained when the interpolation factor I=2 is employed and when actual speeds are used.
mean absolute relative difference.
It's the relative difference that is important.
Because "labeling" the speed of looming sounds is typically not a priority in a natural environment, the primary concern here was to examine relative differences between conditions rather than absolute estimates of speed.
The differences in PSD and STFT of both downstream and upstream trusses of the bridge indicated some variations for different speeds of the moving vehicle but did not present the relative differences quantitatively.
* Beware of studies that report large relative differences.
