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Forceful, unilateral contractions modulate corticomotor paths targeting the resting, 27 contralateral hand. However, it is unknown if mirror-viewing of a slowly moving but 28 forcefully contracting hand would additionally affect these paths. Here we examined 29 corticospinal excitability and short-interval intracortical inhibition (SICI) of the right-30 ipsilateral primary motor cortex (M1) in healthy young adults under a no-mirror and mirror 31 condition at rest and during right wrist flexion at 60% maximal voluntary contraction (MVC). 32 During the no-mirror conditions, neither hand was visible, whereas in the mirror conditions, 33 participants looked at the right hand’s reflection in the mirror. Corticospinal excitability 34 increased during contractions in the left flexor carpi radialis (FCR)(contraction: 0.41 mV vs. 35 rest: 0.21 mV) and extensor carpi radialis (ECR)(contraction: 0.56 mV vs. rest: 0.39 mV) but 36 there was no mirror …