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Lecture 15

NEUR 3610 Lecture Notes - Lecture 15: Middle Cerebral Artery, Dyslexia, Paraphasia

Course Code
NEUR 3610
Kolb Bryan

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Nov 6 Lecture
19.7 Diagram
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
first place.
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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