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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 the Global North. [3]
In the last two decades, significant advances occurred in our understanding of the neural processing of sounds in primates. Initially by recording of neural activity in the auditory cortices of monkeys [18] [19] and later elaborated via histological staining [20] [21] [22] and fMRI scanning studies, [23] 3 auditory fields were identified in the primary auditory cortex, and 9 associative ...
Global aphasia is a type of aphasia that occurs in people where a large portion of the language center of the brain has been damaged and results in deficits in all modalities of language. [12] Broca's aphasia, also referred to as expressive aphasia, is an aphasic syndrome in which there is damage in left hemisphere, specifically in the Broca's ...
In neuroscience and psychology, the term language center refers collectively to the areas of the brain which serve a particular function for speech processing and production. [1] Language is a core system that gives humans the capacity to solve difficult problems and provides them with a unique type of social interaction . [ 2 ]
In a new study involving a group of polyglots, the brain activity of the participants was monitored using a method called functional magnetic resonance imaging as they listened to passages read in ...
If the damage extends posteriorly, visual connections are disrupted, and the patient will have difficulty understanding written language. Therefore, the localization of the two best-known aphasias mirrors the grossest dichotomy in brain organization: anterior areas are specialized for motor output, and posterior areas for sensory processing.
Lesions in these parts of the brain impair language comprehension and language production, respectively. Paul Broca was the first to note that the left hemisphere of the brain appeared to be localized for language function, particularly for right handed patients. Modern neuroscientific research has verified this, though language may be ...
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 brain damage. [36] All of the neuronal changes recruit areas not originally or directly responsible for large portions of linguistic processing. [37]