Cylinder orientation (α°) | Profile orientation (θ°) | θ° − α° | F |
---|---|---|---|

Cylinder 521 m^{−1} | |||

9 | 11.3 | 2.3 | 3134 |

4.5 | 5.3 | 0.8 | 4234 |

0 | −0.06 | −0.06 | 4715 |

−4.5 | −6.13 | −1.63 | 4288 |

−9 | −11.6 | −2.6 | 3965 |

Cylinder 172 m^{−1} | |||

9 | 17.3 | 8.3 | 6042 |

4.5 | 9.3 | 4.8 | 6747 |

0 | 2.3 | 2.3 | 5992 |

−4.5 | −6.0 | −1.5 | 5424 |

−9 | −14.9 | −5.9 | 4738 |

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 equation*ae*^{−b(ycosθ − xsinθ)2}using 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^{−1}and 449 for curvature of 172 m^{−1}.