NEUR 3610 Lecture Notes - Lecture 15: Middle Cerebral Artery, Dyslexia, Paraphasia
SchoolUniversity of Lethbridge
Course CodeNEUR 3610
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Nov 6 – Lecture
2 routes for speech:
• Dorsal route more automatic speech
• Ventral route more context and world knowledge based.
The most common place to have a stroke is middle cerebral artery which runs up the temporal lobe –
19.13: symptoms from each place.
Role of right hemisphere in language 19.4:
• Large left hemisphere language – globally aphasic at first but then some stuff comes back.
• But right hemisphere is capable of language – but has no concept of grammar or syntax. Right
also can’t really produce much language, but has quite a bit of comprehension.
• People who recover from strokes and aphasias go through a developmental process similar to
what children go through when learning to talk. So takes as long to recover as it learned in the
Disorders of Language (19.2): not quite as simple as Wernicke’s and Broca’s areas
o Inability to write (agraphia) and loss of tone in voice (aprosidia)
In addition – 3 kinds of language deficits to distinguish:
1. Aphasias: like above or on 19.3 (don’t have to memorize)
2. Anarthria: this is a motor problem. Like ALS for example, or problems in the throat, but not
problems in the brain. Can sound similar
3. Paraphasia: symptom whereby people make unintended words. Ex – talking about your mother
and refer to her as your wife. Problem choosing the right word – word mixing.
Assessment of aphasia 19.5:
• Token test and a bunch of other ways
We can make distinctions in reading between acquired dyslexia and developmental dyslexia – acquired
is from brain injury and developmental in how the brain develops.
• Being unable to read is not a single problem:
o Attentional dyslexia: can read letters, but can’t read the words – put them together to
form the word. Or sometimes can only read one word in a sentence.
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