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Grammar expert plus portabel1/7/2023 ![]() Although the severity of impairment plays a role in determining AAC needs and appropriate interventions, other factors include level of communication complexity, skills of communication partners, communication environments and environmental factors, rate of communication, and proficiency at strategic communication, among others. The primary rationale for individuals’ electing to use augmentative and alternative communication (AAC) is the inability of their natural speech to meet all of their daily communication needs. With impairment, alterations in speech subsystems become apparent and the complexity revealed. For many, speech is the external expression of language, and the motor skills involved are performed with accuracy and speed, without conscious control ( Netsell, 1982). The ease and simplicity of use of typical natural speech mask the complexity of a speech production process that involves precise control and coordination of respiration, voice, articulation, and language comprehension and expression ( van der Merwe, 2009). Augmentative and Alternative Communication and Voice Products and Technologies
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