Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Childhood apraxia of speech(also: CAS, Developmental verbal dyspraxia, DVD)
- A motor speech disorder in which the brain has difficulty planning and coordinating the precise movements of the tongue, lips, jaw, and palate needed for intelligible speech. Unlike other speech disorders caused by muscle weakness, CAS involves impaired motor programming — the…
- Co-contraction(also: Unintended Co-contraction, Muscle Co-activation)
- The simultaneous activation of antagonistic muscles — for example, the biceps and triceps firing at the same time. Some co-contraction is normal and useful for joint stability, but involuntary or excessive co-contraction is common in conditions such as spasticity, cerebral…
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