Lateralization of motor excitability during observation of bimanual signs

Riikka Möttönen, Harry Farmer, Kate E. Watkins

Research output: Contribution to journalArticlepeer-review

12 Citations (SciVal)


Viewing another person's hand actions enhances excitability in an observer's left and right primary motor (M1) cortex. We aimed to determine whether viewing communicative hand actions alters this bilateral sensorimotor resonance. Using single-pulse transcranial magnetic stimulation (TMS), we measured excitability in the left and right M1 while right-handed non-signing participants observed bimanual communicative hand actions, i.e., meaningful signs in British Sign Language. TMS-induced motor evoked potentials were recorded from hand muscles during sign observation before and after teaching the participants to associate meanings with half of the signs. Before this teaching, when participants did not know that the presented hand actions were signs, excitability of left and right M1 was modulated equally. After learning the meanings of half the signs, excitability of the left, but not right, M1 was significantly enhanced. This left-lateralized enhancement of M1 excitability occurred during observation of signs with known and unknown meanings. The findings suggest that awareness of the communicative nature of another person's hand actions strengthens sensorimotor resonance in the left M1 cortex and alters hemispheric balance during action observation.

Original languageEnglish
Pages (from-to)3173-3177
Number of pages5
Issue number10
Early online date1 Jul 2010
Publication statusPublished - Aug 2010


  • Action observation
  • Communication
  • Mirror neurons
  • Sign language
  • Transcranial magnetic stimulation

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology


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