ABSTRACT
Disorders coming about in the latter way are named Dysarthria. Unilateral paralysis does not cause considerable Dysarthria. The disturbance is hardly noticeable, but the patients complain about subjective difficulty. Dysarthria due to lesions of the upper motor neuron manifests itself in principle in that the patient’s voluntary control over emotional expression is impaired. The articulatory muscles are weak, or rigid. Such Atactic Dysarthria of a graver kind is found also in Hereditary Ataxia. Speech is, on the whole, slow, syllables are uttered explosively and scanned, vowels are sometimes broadened, consonants slurred, sometimes nasal. Intonation is more or less impaired. Diseases of the brain stem, such as Hepato-lenticular Degeneration and the Parkinsonian Syndrome, show Dysarthria and dysphagia as prominent symptoms. In some cases central Dysarthria can be greatly improved by associating the patient’s ideas of speech-sounds with such sounds as are encountered in emotional behaviour.
