Racial Differences in Brain Activity

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Affected Speech Hearing

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In the previous post we began speaking about patients with affected secondary zones. To such patients 'dot' sounds like 'tot', 'lot' or 'cot'. The patient can neither distinguish these words when he hears them nor pronounce them correctly, and he has difficulty whenever he has to say these words in a conversation. Failing to find the appropriate word, he tries to find a substitute, for example, 'the thing you do your hair with' for 'comb', or 'land without water' for 'desert'. In the most serious cases patients have so many 'difficult' words and make so many mistakes in pronouncing them, that their speech becomes quite incomprehensible.

Naturally, if one cannot sense the differences between the words 'dot', 'tot' and 'cot', one's faculty to understand speech is generally affected. A curious but so far unaccountable fact is that such patients find it especially hard to identify nouns, and their speech mostly consists of link words, prepositions, adverbs, verbs and all kinds of words expressing relationship.

Another curious fact is that when speech hearing is affected, people do not become tone-deaf. Several cases have been recorded where gifted composers lost their speech hearing and the faculty to speak as a result of a serious illness, but were still able to write music and successfully continued their creative work. On the other hand, a lesion of the corresponding zones in the right cerebral hemisphere does not affect the patient's speech, but may make him tone-deaf.

Written speech is also affected in the case of injury to the secondary zones of the acoustic analyser. The patients can copy or write such familiar words as 'mother' or 'moon', sign their name and reproduce such common letter codes as OK or IOU, but they become completely incapable of writing a note or even a few lines of dictation coherently. Their ability to read is also affected. They can recognize and understand some very familiar words or phrases, but become incapable of reading separate letters, syllables or less familiar words.

Written by brainer

January 5th, 2010 at 12:46 pm