People with severe speech and physical impairments (SSPI) often have trouble communicating due to disabilities that affect their muscle control, such as cerebral palsy (CP), amyotrophic lateral sclerosis (ALS), or stroke. These individuals can benefit greatly from augmentative and alternative communication (AAC) devices and programs that can translate typed text to speech, like the computer system used by astrophysicist Stephen Hawking who has ALS.
Amyotrophic lateral sclerosis (ALS) is a nervous system disorder that interferes with how the brain and spine transmit signals to muscles and causes loss of motor function including mobility and speech. People with ALS (pALS) may experience such significant speech impairments that they cannot rely on their natural speech to meet their communication needs in face-to-face interactions.
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