Muscle activity in the m. adductor mandibulae superficialis when biting at a more posterior (caudal) bite point and a more anterior (rostral) bite point in the mouth. 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.