Probability of the upper-limb muscle response during stimulation along the rostrocaudal axis
The values in the box are calculated based on the motor threshold (MT), maximum response (MaxR), and amount of post-activation depression (R2/R1 ratio). Probabilities of muscle activation are illustrated by the opacity of different colors aligned with the stimulation electrodes. UA: upper arm; FA: forearm; HD: hand, BIC: biceps brachii; TRIC: triceps brachii; FCR: flexor carpi radialis; ECR: extensor carpi radialis; APB: abductor pollicis brevis; ADM: abductor digiti minimi.