Figure 3. The median (19 subjects) effect of movement congruence and blocking the digital nerves of the grasping and test digits on perceived vertical spacing between the index fingers.

A, perceived vertical spacing between the index fingers when the hands are intact for congruent and incongruent movement trials. A significantly smaller median perceived spacing was reported after congruent movement compared to incongruent movement (P= 0.007). B, results for the same conditions after the digital nerves of the test index finger and the grasping index finger and thumb were blocked with local anaesthetic. Again, there is a significantly smaller perceived spacing after congruent movement compared to incongruent movement (P < 0.001). Results are shown as median ± interquartile range.