Higher Cortical Function - Constantinidis - Exam 1 Flashcards
- The cortex contains unimodal and multimodal (=multi-sensory) processing areas
- “___-____” areas integrate information from multiple senses—these are key for higher cognitive function, not tied to processing of sensory info from one sense
- frontal heteromodal (heteromodal cortex refers to a region that receives input from multiple sensory or multimodal areas.
- Two major areas of heteromodal cortex are generally identified) association cortex (prefrontal cortex) + lateral parietal and temporal heteromodal association cortex
- The cortex contains unimodal and multimodal (=multi-sensory) processing areas
- “Multi-sensory” areas integrate information from multiple senses—these are key for higher cognitive function, not tied to processing of sensory info from one sense
- frontal heteromodal association cortex (prefrontal cortex) + lateral parietal and temporal heteromodal association cortex
- Language– a prototypical cognitive function
- Language is:
- Both localized and distributed– is localized to parts of the brain but these areas are distributed all around the brain
- Language is:
___ are language deficits resulting from brain damage.
___ are diagnosed according to the patient’s ability to express language.
- Language– a prototypical cognitive function
- Language is:
- Both localized and distributed– is localized to parts of the brain but these areas are distributed all around the brain
- Language is:
Aphasias are language deficits resulting from brain damage.
Aphasias are diagnosed according to the patient’s ability to express language.
What are the numbers and what is the blue shaded region around?
1- Wernickes
- Brocas
All the blue shaded areas are all part of the multi-modal system. They all have something to do with language.
What are the regions for?
What is the significant of area 4, and 5?
- Brocas area - generating words
- Wernickes - understanding words
- Arcute - interconnects Broca’s and Wernicke’s areas
- and 5. Supramarginal and Angular gyrus are important because they are part of the multi-modal association system that is involved with language procsesing.
Also, since the arcuate fasciales travel underneath the supramarginal and angular gyrus, if you get localized lesions there, most likely you will also get damage to the arcuate fascicles (which normally connects Brocas and Wernickes to each other).
T/F:
Localization of function in human brain is quite variable– Broca’s and Wernicke’s areas are NOT tied down to the same exact location in every person’s brain, when doing surgery, doctor must test each part of brain via electrical stimulation before proceeding. Therefore, mapping is required prior to epilepsy surgery.
TRUE
Localization of function in human brain is quite variable– Broca’s and Wernicke’s areas are NOT tied down to the same exact location in every person’s brain, when doing surgery have to test each part of brain via electrical stimulation before proceeding. Therefore, mapping is required prior to epilepsy surgery.
Language processing displays cerebral dominance:
- ___ side – _____ of language, expression of substantive content
- Most people are left hemisphere dominant for language
- Broca’s and Wernicke’s areas are in the ____ hemisphere for 90% of people
- ___ side – comprehension of language, expression of emotional content, ___ (use of inflection and tone to convey meaning, aka not speaking like a robot)
Language processing displays cerebral dominance:
-
LEFT side – comprehension of language, expression of substantive content
- Most people are left hemisphere dominant for language
- Broca’s and Wernicke’s areas are in the LEFT hemisphere for 90% of people
- RIGHT side – comprehension of language, expression of emotional content, prosody (use of inflection and tone to convey meaning, aka not speaking like a robot)
Types of Aphasia
- ___ : in the classical form, the patient is not fluent. The patient cannot speak, but can comprehend language. The person has no fluency, cannot repeat words, but comprehends.
- ___ : the patient is not fluent, does comprehend, and is abe to repeat some words to some extent. This is a case that occurs when Broca’s area is intact, but there is a lesion in the multimodal motor areas around Broca’s area. We still need these areas to develop language, but because Broca’s is intact, the patient can repeat SOME words.
- ___ – complete destruction of everything (both Broca’s and Wernicke’s are destroyed).
- ____ - patients are fluent, can generate words, but the words they are generating are not logical. They speak a lot, but it does not make any sense. These patients are not able to comprehend language either, so when you speak to them, they will not be able to understand the content. Because of this, they cannot repeat words either.
- ___ : patient is fluent, cannot comprehend, but has some ability to repeat words. This is not caused by a lesion in Wernicke’s area itself, but a lesion in the transcortical sensory areas AROUND Wernickes (which again, is necesarry to comprehend lanaguge). However, even though these regions are lesioned, Wernicke’s and Broca’s are still intact, so the patient can repeat SOME words.
- ___ : patient is not fluent, cannot comprehend, but still has the ability to repeat words because their Broca’s and Wernicke’s areas are still intact (they can hear and repeat the word). This is the case when someone has simltaneous damage to the transcortical motor and sensory association areas. Broca’s and Wernicke’s are still spared, so patient can still hear and repeat the word.
- ___ - Patient has fluency, has comprehension, but cannot repeat words. The damage is at the arcuate fasciculus. The patient cannot repeat words bceause Broca’s and Wernicke’s is disconnected
- __ ___ - Patient is fluent, comprehends and can repeat words. It is possible to have a very localized lesion. Patient has the general language function, but if you test them they have some difficulty naming things (orange example on youtube).
Types of Aphasia
- Broca’s Aphasia : in the classical form, the patient is not fluent. The patient cannot speak, but can comprehend language. The person has no fluency, cannot repeat words, but comprehends.
- Transcortical motor lesions: the patient is not fluent, does comprehend, and is able to repeat some words to some extent. This is a case that occurs when Broca’s area is intact, but there is a lesion in the multimodal motor areas around Broca’s area. We still need these areas to develop language, but because Broca’s is intact, the patient can repeat SOME words.
- global aphasia – complete destruction of everything (both Broca’s and Wernicke’s are destroyed).
- Wernicke’s aphasia - patients are fluent, can generate words, but the words they are generating are not logical. They speak a lot, but it does not make any sense. These patients are not able to comprehend language either, so when you speak to them, they will not be able to understand the content. Because of this, they cannot repeat words either.
- Transcortical sensory aphasia : patient is fluent, cannot comprehend, but has some ability to repeat words. This is not caused by a lesion in Wernicke’s area itself, but a lesion in the transcortical sensory areas AROUND Wernickes (which again, is necesarry to comprehend lanaguge). However, even though these regions are lesioned, Wernicke’s and Broca’s are still intact, so the patient can repeat SOME words.
- Mixed transcortical aphasia : patient is not fluent, cannot comprehend, but still has the ability to repeat words because their Broca’s and Wernicke’s areas are still intact (they can hear and repeat the word). This is the case when someone has simltaneous damage to the transcortical motor and sensory association areas. Broca’s and Wernicke’s are still spared, so patient can still hear and repeat the word.
- Conduction aphasia - Patient has fluency, has comprehension, but cannot repeat words. The damage is at the arcuate fasciculus. The patient cannot repeat words bceause Broca’s and Wernicke’s is disconnected
- Anomic aphasia - Patient is fluent, comprehends and can repeat words. It is possible to have a very localized lesion. Patient has the general language function, but if you test them they have some difficulty naming things (orange example on youtube).
Aphasias:
___ – complete destruction of everything
___– BA and WA spared, but hight function/comprehension disrupted
___– good comprehension (since that’s WA), but can’t repeat words. They have understanding of their condition, know what they hear and can process it but can get out the words
____– “dynamic aphasia,” lesion in anterior superior frontal lobe, usually speak one or two word sentences, severely impaired writing ability
____– can’t comprehend but can speak fluently, will just keep talking but may be nonsense (think they’re making sense but they really aren’t)
___– multisensory cortex damaged around WA but WA itself is preserved
___– lesion of connection between areas, can speak and understand but can’t repeat
____– everything checks out (they’re fluent, can comprehend, and can repeat) but still have something going on
- Ask open ended questions to tease out the problem, may not be immediately evident
- Test patient with uncommon words
Usually result of very small focal lesion
Aphasias:
Global– complete destruction of everything
Mixed transcortical– BA and WA spared, but hight function/comprehension disrupted
Broca’s– good comprehension (since that’s WA), but can’t repeat words
Have understanding of their condition, know what they hear and can process it but can get out the words
Transcortical motor– “dynamic aphasia,” lesion in anterior superior frontal lobe, usually speak one or two word sentences, severely impaired writing ability
Wernicke’s– can’t comprehend but can speak fluently, will just keep talking but may be nonsense (think they’re making sense but they really aren’t)
Transcortical sensory– multisensory cortex damaged around WA but WA itself is preserved
Conduction– lesion of connection between areas, can speak and understand but can’t repeat
Anomic– everything checks out (they’re fluent, can comprehend, and can repeat) but still have something going on
- Ask open ended questions to tease out the problem, may not be immediately evident
- Test patient with uncommon words
Usually result of very small focal lesion
Blood supply to language areas is provided by a combination of the ____ and ___ arteries into a “____” area
____ mostly supplied by MCA superior division
____ mostly supplied by MCA inferior division
These areas a re a common source of language deficits as a result from ___.
Blood supply to language areas is provided by a combination of the ACA and MCA arteries into a “watershed” area
BA’s mostly supplied by MCA superior division
WA’s mostly supplied by MCA inferior division
These areas a re a common source of language deficits as a result from stroke.
Other language related conditions have variable causes, including damage to visual, attention, or motor brain areas
- ____– inability to read
- ____– inability to write
- ____– is a ____ language defecit, NOT a brain anatomical abnormality. This entails haing difficulty reading words correctly, having deficits in phonological processing during reading (ex. can’t combine phonologic and visual aspect of words)
Other language related conditions have variable causes, including damage to visual, attention, or motor brain areas
- Alexia– inability to read
- Agraphia– inability to write
- Dyslexia– is a DEVELOPMENTAL language defecit, NOT a brain anatomical abnormality. This entails haing difficulty reading words correctly, having deficits in phonological processing during reading (ex. can’t combine phonologic and visual aspect of words)
Question: a 50 year old male presents with impaired fluency, intact comprehension and impaired ability to repeat words. When asked any question, he always responsd with a single word: “Hodor.”
Damage to which cortical area is the most likely cause of this patient’s pattern of impariment?
Question: a 50 year old male presents with impaired fluency, intact comprehension and impaired ability to repeat words. When asked any question, he always responsd with a single word: “Hodor.”
Damage to which cortical area is the most likely cause of this patient’s pattern of impariment?
This patient has Broca’s Aphasia.
Attention– directed/selective thought, associated with the ____ lobe
Behavioral consequences of attention– enhances detection and recognition, speeds reaction time, is the gateway to memory
Neural substrates of attention– ___ ___ CORTEX (most importantly), but also ____ cortex and subcortical structures (___ nucleus of thalamus and ____colliculus)
Attention– directed/selective thought, associated with the parietal lobe
Behavioral consequences of attention– enhances detection and recognition, speeds reaction time, is the gateway to memory
Neural substrates of attention– posterior parietal CORTEX (most importantly), but also prefrontal cortex and subcortical structures (pulvinar nucleus of thalamus and superior colliculus).
“Pay attention to the substidute teacher, ms. Corwin, otherwise the superrior intentdent will pulvaiize your PF!”
Neglect is the flip side of attention– the ____ ____ lobe is dominant for spatial attention. This is different from language. Where is language localized?
Neglect is the flip side of attention– the RIGHT parietal lobe is dominant for spatial attention.
Remember– Language is Left, attention is right (and each hemisphere is responsible for the opposite side’s function)
Explain each picture (red part indicates the lesion)
____ sided stroke = severe attention defecit leading to severe LEFT neglect.
___ sided stroke = minimal RIGHT neglect
The most severe attentional distortion, is caused by a ____ parietal lesion.
Right sided stroke = severe attention defecit leading to severe LEFT neglect
Left sided stroke = minimal RIGHT neglect
The most severe attentional distortion, is caused by a posterior parietal lesion.