Figure 2
Comparison of the experimental results with the literature. Data points are fitted with logarithmic regressions (displayed as solid lines). The regression equations are presented in two forms with their goodness of fit. Thresholds for the haptic gradients, converted to time with the finger velocity value, are shown in red. Thresholds from the literature on the perception of tempo gradients (accelerando)23,24,25 are displayed in blue. Thresholds from the meta-analysis of Hart26, who gathered data from many studies on the perception of frequency chirps (glissando), are shown in green27,28,29,30,31.
