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Speech sound disorder (SSD) is the term used to describe individuals who have difficulty producing sounds of the language. Speech production involves articulation, a process by which sounds are formed by moving the articulators (the lips, tongue, teeth, jaw, and velum) in different positions. Articulator movements coordinate with other components of the speech production system, including the respiratory system (which provides air supply for generating sound), the phonatory system (which includes the larynx and vocal folds, structures involved in generating sound), and the velopharynx (which separates the oral and nasal cavities so that air is directed into one or both areas). Speech sounds, also called phonemes, are strung together to form words. Phonology is the rules that govern how phonemes are combined. SSD can ...

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