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Aphasia refers to a family of language disorders that usually stem from injury, lesion, or atrophy to the left side of the brain that result in reception, perception, and recall of language; in addition, language formation and expressive capacities may be inhibited.
Aphasia, also known as dysphasia, [a] is an impairment in a person’s ability to comprehend or formulate language because of damage to specific brain regions. [2] The major causes are stroke and head trauma; prevalence is hard to determine, but aphasia due to stroke is estimated to be 0.1–0.4% in developed countries. [3]
Primary progressive aphasia is a rare disorder where people slowly lose their ability to talk, read, write, and comprehend what they hear in conversation over a period of time. It was first described as a distinct syndrome by Mesulam in 1982. [ 5 ]
Agrammatism was first coined by Adolf Kussmaul in 1887 to explain the inability to form words grammatically and to syntactically order them into a sentence. Later on, Harold Goodglass defined the term as the omission of connective words, auxiliaries and inflectional morphemes, all of these generating a speech production with extremely rudimentary grammar.
Although disorders such as expressive aphasia, conduction aphasia, and dysarthria involve similar symptoms as apraxia of speech, the disorders must be distinguished in order to correctly treat the patients. [citation needed] While AOS involves the motor planning or processing stage of speech, aphasic disorders can involve other language processes.
It is unrelated to problems with understanding language (that is, dysphasia or aphasia), [3] although a person can have both. Any of the speech subsystems ( respiration , phonation , resonance , prosody , and articulation ) can be affected, leading to impairments in intelligibility, audibility, naturalness, and efficiency of vocal communication ...
Speech–language pathology (a.k.a. speech and language pathology or logopedics) is a healthcare and academic discipline concerning the evaluation, treatment, and prevention of communication disorders, including expressive and mixed receptive-expressive language disorders, voice disorders, speech sound disorders, speech disfluency, pragmatic language impairments, and social communication ...