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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]
Psycholinguistics or psychology of language is the study of the interrelation between linguistic factors and psychological aspects. [1] The discipline is mainly concerned with the mechanisms by which language is processed and represented in the mind and brain; that is, the psychological and neurobiological factors that enable humans to acquire, use, comprehend, and produce language.
The lemma is defined as the structure within the mental lexicon that stores semantic and syntactic information about a word, such as part of speech and the meaning of the word. Research has shown that the lemma develops first when a word is acquired into a child's vocabulary, and then with repeated exposure the lexeme develops. [4]
Language acquisition is the process by which humans acquire the capacity to perceive and comprehend language.In other words, it is how human beings gain the ability to be aware of language, to understand it, and to produce and use words and sentences to communicate.
Semantic dementia [23] is a condition in which words and phrases slowly begin to lose meaning, and comprehension is lost because of a deterioration in the semantic memory. This is usually characterized by behavior changes, fluent speech but with no meaning, preserved syntax and grammar, and the impaired ability to recognize objects.
This is because Wernicke's area is responsible for assigning meaning to the language that is heard, so if it is damaged, the brain cannot comprehend the information that is being received. Poor word retrieval: ability to retrieve target words is impaired. [2] This is also referred to as anomia, and it is often classified into the following subsets:
Speech generally includes important content words but leaves out function words that have more grammatical significance than physical meaning, such as prepositions and articles. [3] This is known as "telegraphic speech". The person's intended message may still be understood, but their sentence will not be grammatically correct.
In general, it is difficult to test for linguistic intelligence as a whole, therefore various types of verbal fluency tests are often used. [5] [7] [16] Semantic Fluency Test – Subjects are asked to produce words in groups, such as animals, kitchen tools, fruits, etc. This type of test focuses on the subject's ability to generate words that ...