Two-Point Discrimination & Orientation
These procedures are performed with either a two-point discrimination disc or a calibre. In the two-point discrimination test, the subject is touched by two points with varying distances between them, and the minimal distance at which the subject can perceive two points is determined. The two-point orientation test is a variant of the conventional two-point discrimination test. In this test variant, the subject is asked about the probe's orientation rather than if two points are felt. Consequently, this test determines the minimal distance at which the two points' orientation can be perceived.
Grating Orientation
The grating orientation test like the two-point orientation determines the minimal distance at which the orientation of an object can be perceived. However, the grating orientation is usually performed with circular probes on which there are gratings with varying inter-grating distances.
Semmes–Weinstein Monofilaments
With Semmes-Weinstein monofilaments the minimal force applied to the skin that can be perceived or felt as pain is determined. The test is performed by applying a series of monofilaments that each provide a constant force to the skin.
