4.5 Article

Chewing modulates the human cortical swallowing motor pathways

Journal

PHYSIOLOGY & BEHAVIOR
Volume 249, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.physbeh.2022.113763

Keywords

Mastication; Swallowing; Transcranial magnetic stimulation (TMS)

Funding

  1. LOTTE Research Promotion Grant from LOTTE foundation [2021B]
  2. Ministry of Education, Culture, Sports, Science and Technology of Japan (JSPS KAKENHI) [JP19K10243]

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The study found that chewing movements suppress swallowing-related activity in the pharyngeal motor circuit.
When eating, mastication is always followed by swallowing. The present study assessed the effect of mastication on swallowing-related neural pathways in humans. Twenty healthy volunteers participated and underwent baseline transcranial magnetic stimulation to evaluate cortico-pharyngeal and cortico-hand motor-evoked potentials (MEPs). Next, they performed a chewing task and a swallowing task. Repeated-measures ANOVA revealed that pharyngeal MEPs were significantly higher after the swallowing task than after the chewing task, even though the number of swallows across tasks was matched. This implies that chewing movements suppress swallowing-related activity in the pharyngeal motor circuit.

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