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Folds are created in rock when they experience compressional stress. This is when the rock is being pushed inward from both sides. This is like if you put a spring between your hands and push them together. As you push, you're compressing the spring, and rock can be compressed in the same way over long periods of time.
However, during speech at a normal loudness or chest and head singing, deeper layers of the vocal folds are set into vibration. Because of the involvement of multiple layers, a more complicated model of the vocal folds must be used: the Body-Cover Model of Fo Control. Roles of the TA and CT Muscles The tension of the vocal fold is the primary determinant of Fo control.