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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]
In very severe forms of expressive aphasia, a person may only speak using single word utterances. [4] [5] Typically, comprehension is mildly to moderately impaired in expressive aphasia due to difficulty understanding complex grammar. [4] [5] It is caused by acquired damage to the frontal regions of the brain, such as Broca's area. [6]
Muteness is the complete inability to speak. Speech sound disorders involve difficulty in producing specific speech sounds (most often certain consonants, such as /s/ or /r/), and are subdivided into articulation disorders (also called phonetic disorders) and phonemic disorders. Articulation disorders are characterized by difficulty learning to ...
They had lost the ability to speak after injury to the posterior inferior frontal gyrus (pars triangularis) (BA45) of the brain. [7] Since then, the approximate region he identified has become known as Broca's area, and the deficit in language production as Broca's aphasia , also called expressive aphasia .
SLPs may also help these individuals to speak more slowly and to manage the physical tension involved in the communication process. Fluency may be developed by selecting a slow rate of speech, and making use of short phrases and sentences. With success, the speed may be increased until a natural rate of smooth speech is achieved. [9]
Neuronal changes after damage to the brain such as collateral sprouting, increased activation of the homologous areas, and map extension demonstrate the brain's neuroplastic abilities. According to Thomson, "Portions of the right hemisphere, extended left brain sites, or both have been shown to be recruited to perform language functions after ...
Anomia can be genetic or caused by damage to various parts of the parietal lobe or the temporal lobe of the brain due to traumatic injury, stroke, or a brain tumor. [8] While anomic aphasia is primarily caused by structural lesions, they may also originate in Alzheimer's disease (anomia may be the earliest language deficit in posterior cortical ...
In human development, muteness or mutism [1] is defined as an absence of speech, with or without an ability to hear the speech of others. [2] Mutism is typically understood as a person's inability to speak, and commonly observed by their family members, caregivers, teachers, doctors or speech and language pathologists.