Figure 1.
Illustration of the experimental device.
Table 1.
Twelve materials of the Pleasant Touch Scale [25] ordered according to their pleasantness level.
Figure 2.
Illustration of rapid force fluctuations in terms of spatial frequencies.
Rapid force fluctuations for paper (panel A) and for sandpaper (panel B). A power function was fitted to the spectrum of each sample.
Figure 3.
Correlation between the ordinal pleasantness scores of the present study and the unidimensional linear pleasantness measures determined in [25].
Each point represents one sample of material.
Table 2.
Characterization of studied variables.
Figure 4.
Illustration of correlations between (i) fT - pleasantness and (ii) μ - pleasantness.
Mean±std tangential force component, fT, (top) and the mean±std dynamic coefficient of friction, μ, (bottom) variations according to the material pleasantness levels±standard error being explored.
Figure 5.
Illustration of correlations between (i) α - pleasantness and (ii) β - pleasantness.
Illustration of the mean±std values of the decay coefficient, α, (top) and the mean±std values of the offset, β, (bottom) variations according to the material pleasantness levels±standard error being explored.
Figure 6.
Illustration of the Principal Component Analysis.
Representation of the two first components summarizing our data set. The co-ordinates of the components along each axis represent the strength of relationship between that variable and each component.
Table 3.
Factor loadings of each variable as determined by the Principal Component Analysis.