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This occurs due to proximity of facial and spinal nerves to the voluntary activation of shoulder muscle groups, leading to pathway crossover, along with motor overflow caused by physical strain. Its also possible that the same mechanism that causes some people to grunt when they lift weights also causes other people to twitch or grimace, she says

Its great when people know to ask for help because you dont know everything, but a lot of people are too embarrassed to admit that

10.1046/j.1365-2443.2002.00584.x 62 Ikerchem S L (2014)

Polarimetric image sensor and Fermi level shifting induced multichannel transition based on 2D PdPS