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Muscle activity in the m. pterygoideus typicus middle when biting (a) a food item with a 50 N vertical and 5 N horizontal resistance and (b) a food item with a 30 N vertical and 15 N horizontal resistance. 1, jaw-opening phase; 2, jaw-closing phase; 3, food-crushing phase; 4, anterior jaw-shearing phase; 5, resting phase. Plots scaled so to peak muscle activity. y-axis relates to muscle activity and x-axis relates to time/biting phases.
