Spastic Dysarthria

Spastic Dysarthria is caused by upper motor neuron damage. Because of the bilateral innervation of the speech mechanism above the level of the bulbar system, it has been suggested that bilateral impairment of the corticobulbar tract is required to produce spastic dysarthria. This form of dysarthria affects voluntary movements of the speech mechanisms. A disinhibition of the motor mechanisms of crying and laughing is often associated with spastic dysarthria, resulting in what is sometimes called emotional lability, but in fact this is a disinhibited motor reflex. The speech of the client with spastic dysarthria sounds like it is being produced against considerable resistance. The slow, labored articulation and strangled voice quality reflect limited range and spasticity of musculature.