Transcranial magnetic stimulation induced early silent period and rebound activity re-examined


Autoři: Mustafa Görkem Özyurt aff001;  Heidi Haavik aff002;  Rasmus Wiberg Nedergaard aff002;  Betilay Topkara aff001;  Beatrice Selen Şenocak aff003;  Mehmet Berke Göztepe aff004;  Imran Khan Niazi aff002;  Kemal Sitki Türker aff001
Působiště autorů: School of Medicine, Koç University, Istanbul, Turkey aff001;  Centre for Chiropractic Research, New Zealand College of Chiropractic, Auckland, New Zealand aff002;  Frank H. Netter MD School of Medicine, Quinnipiac University, North Haven, CT, United States of America aff003;  School of Medicine, Akdeniz University, Antalya, Turkey aff004
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0225535

Souhrn

Despite being widely studied, the underlying mechanisms of transcranial magnetic brain stimulation (TMS) induced motor evoked potential (MEP), early cortical silent period (CSP) and rebound activity are not fully understood. Our aim is to better characterize these phenomena by combining various analysis tools on firing motor units. Responses of 29 tibialis anterior (TA) and 8 abductor pollicis brevis (APB) motor units to TMS pulses were studied using discharge rate and probability-based tools to illustrate the profile of the synaptic potentials as they develop on motoneurons in 24 healthy volunteers. According to probability-based methods, TMS pulse produces a short-latency MEP which is immediately followed by CSP that terminates at rebound activity. Discharge rate analysis, however, revealed not three, but just two events with distinct time courses; a long-lasting excitatory period (71.2 ± 9.0 ms for TA and 42.1 ± 11.2 ms for APB) and a long-latency inhibitory period with duration of 57.9 ± 9.5 ms for TA and 67.3 ± 13.8 ms for APB. We propose that part of the CSP may relate to the falling phase of net excitatory postsynaptic potential induced by TMS. Rebound activity, on the other hand, may represent tendon organ inhibition induced by MEP activated soleus contraction and/or long-latency intracortical inhibition. Due to generation of field potentials when high intensity TMS is used, this study is limited to investigate the events evoked by low intensity TMS only and does not provide information about later parts of much longer CSPs induced by high intensity TMS. Adding discharge rate analysis contributes to obtain a more accurate picture about the characteristics of TMS-induced events. These results have implications for interpreting motor responses following TMS for diagnosis and overseeing recovery from various neurological conditions.

Klíčová slova:

Action potentials – Electrodes – Electromyography – Muscle contraction – Transcranial magnetic stimulation – Excitatory postsynaptic potentials – Synaptic potential – Motor cortex


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2019 Číslo 12