CMD 460 Lecture Notes - Lecture 1: Aphasia, Language Disorder, Paraphasia
Document Summary
A language disorder due to language-dominant hemisphere damage (97% of people have the left hemisphere as their language-dominant) Recent research shows that many individuals with aphasia also show some level of cognitive deficits (attention, verbal memory, executive function) The underlying cause of aphasic language deficits is still under debate (language impairment vs. overall processing deficits) Most frequently caused by a left hemisphere stroke. Also results from a tbi, right hemisphere stroke (rare) and bilateral strokes. Subcortical aphasia has also been reported: damage to the thalamus, insula, etc. Types of modalities: verbal expression (naming, fluency, repetition) Paraphasia: word substitution: a universally expected feature of aphasia regardless of the lesion site (also found in other neurogenic communicative disorders not an indicator of aphasia type. In fluent speech, syllables are producted rhythmically and speakers use pitch and stress variations that are appropriate to the intended meaning of speech.
