Sit with your hands supported on a table in front of you.
Stand a mirror between your hands with the reflective surface facing your unaffected hand.
When ready, touch and feel different kinds of materials with your unaffected hand.
You could use materials such as wool, cotton, sandpaper, rope, plastic, or metal.
Whilst performing the exercise look into the mirror and visualize the reflection of your unaffected hand as the affected hand.
