Table 2 Differences in displacements estimated by the two types of methods at representative frequencies. DT indicates the differential threshold of human vibrotactile perception

4.3

0.60

2.2 × 10⁻²

8.7 × 10⁻⁴

0.68

0.49

7.0 × 10⁻²

4.3 × 10⁻²

1.4

0.98

1.4 × 10⁻¹

8.6 × 10⁻²