Abstract：
:It is known that articulating different syllables is linked to different grasp actions, e.g. [ti] is linked to precision grip, and [kɑ] to power grip. The aim of the present study was to test whether articulating or hearing these syllables would result in an increased activity in the representation of hand muscles involved in these two actions in a muscle-specific manner. To this end, we used transcranial magnetic stimulation (TMS) to investigate changes in the excitability of the left primary motor cortex (M1) innervating hand muscles while participants articulated or listened to meaningless syllables, listened to a metronome, or observed a fixation cross. The motor-evoked potentials of two hand muscles associated with either a precision or power grip exhibited significantly greater amplitudes during articulation than in passive listening, metronome, and fixation cross conditions. Moreover, these muscles exhibited similar patterns of excitability during articulation regardless of which syllable was articulated. The increased excitability of the left M1 hand area during articulation, but not during perception of the syllables, might be due to the cortico-cortical interaction between the motor representations of oral organs with the hand area.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Komeilipoor N,Tiainen M,Tiippana K,Vainio M,Vainio Ldoi
10.1016/j.neulet.2016.04.004subject
Has Abstractpub_date
2016-05-04 00:00:00pages
154-8eissn
0304-3940issn
1872-7972pii
S0304-3940(16)30209-9journal_volume
620pub_type
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