Several topics on apraxia of speech

Abstract

Several topics on apraxia of speech（AOS）are discussed.　Although many lines of evidence indicate that the responsible region for AOS is the precentral gyrus, AOS-like symptoms are observable in cases with subcortical lesions such as putaminal hemorrhage or infarction in the corona radiata.　Differentiating between AOS and other types of dysarthria may be difficult by error vaviability, which has traditionally been considered an important characteristic of AOS.　AOS may be described as an articulation disorder that is not explicable by basic sensory motor deficits.　AOS is an important, but not the only factor, contributing to non-fluent speech.