Table 3.

Rotation of response profiles

Cylinder orientation (α°)Profile orientation (θ°)θ° − α°F
Cylinder 521 m−1
911.32.33134
4.55.30.84234
0−0.06−0.064715
−4.5−6.13−1.634288
−9−11.6−2.63965
Cylinder 172 m−1
917.38.36042
4.59.34.86747
02.32.35992
−4.5−6.0−1.55424
−9−14.9−5.94738
• Cylinders with curvature of 521 or 172 m−1 were applied to the fingerpad at orientations (α) of 0, ±4.5, and ±9°. The rotation of the SAI response profile (θ°) was calculated by least squares fit of the equationaeb(ycosθ − xsinθ)2using the Levenberg–Marquardt algorithm (Press et al., 1986).F values were calculated by dividing the regression mean square by the residual mean square; the high F values indicate the close fit (all p << 0.001); the numbers of data points were 392 for curvature of 521 m−1and 449 for curvature of 172 m−1.