A type of motor speech disorder that results from damage to the upper motor neurons (UMNs) on one side of the brain. Usually, the cortico-bulbar pathways that control the muscles involved in the speech process are affected. Compared to other types of dysarthria, it is manifested by milder and often temporary disorders. Clinical signs include inaccurate articulation, slowed pace of speech, mild hoarseness, and sometimes mild weakness of the lower face and tongue on the side opposite to the lesion. The most common causes are stroke, tumor or traumatic brain injury affecting one hemisphere of the brain.