Exam 1 - CN (subcortical & unusual aphasias) Flashcards
general layers of the brain
- cortex (grey matter)
- white matter
- basal ganglia & thalamus
- brainstem
extrathalamic
basal ganglia
thalamic
thalamus
relay center
thalamus
specific basal ganglia structures
- caudate nucleus
- internal capsule
- globus pallidus
- putamen
- corpus striatum
- substantia nigra
- lentiform nucleus
- red nucleus claustrum
- amygdala
general location of basal ganglia
between cortex & brainstem
function of basal ganglia
regulating motor function & muscle tone
general location of thalamus:
sits on top of brainstem
function of thalamus
integrates info from all of the senses, except smell & sends info to the cortex
subcortical regions
- basal ganglia
- thalamus
extrathalamic damage
(basal ganglia)
1. Parkinson’s disease
2. Huntington’s disease
thalamic damage
thalamic syndrome
mortality rate is high with damage to this region
thalamic
thalamic syndrome
increased or decreased threshold for sensation, somatosensory issues (touch temp pain)
left side subcortical lesions: white matter only
usually not an aphasia
left side subcortical lesions: basal ganglia only
damage must be extensive to produce an aphasia
left side subcortical lesions: basal ganglia + white matter
when aphasia like symptoms are typically observed
most common left side subcortical lesions
basal ganglia + white matter
basal ganglia + white matter damage
- anterior syndrome
- posterior syndrome
anterior syndrome
basal ganglia + white matter
1. can be confused with broca’s/TCM
- hemiplegia
- slow, dysarthric speech w/ good phrase length & prosody
- good comprehension
- good repetition
- poor oral reading
- poor writing
- poor naming
anterior syndrome
- hemiplegia
- fluent speech w/out dysarthria
- poor comprehension
- good single word but poor sentence repetition
- poor naming
- poor reading & writing
posterior syndrome
posterior syndrome
basal ganglia + white matter
can be confused with wernicke’s/TCS
left side subcortical lesion: thalamic
sometimes confused with TCS aphasia
- hemiplegia
- hemisensory loss
- alteration in level of consciousness
- right visual field defect
- initial mutism, but improve to be verbose
- paraphasias, usually semantic
- hypophonic jargon output
- severe anomia
- good comprehension
- logorrhea
- reduced spontaneous meaningful, verbal output
- preserved repetition
thalamic lesion
hypophonic
talking quietly
hemiplegia is more severe with
subcortical aphasia bc of the role w/ the basal ganglia
motor neuron pathways run next to the
thalamus
dysarthria is more frequent with
subcortical lesions
mutism occurs more frequently with
subcortical lesions (most frequently seen with thalamic lesions)
voice & prosody problems occurs more frequently with
subcortical lesions
paraphasias occur in ___________ but not in _____________ for ___________ aphasias
speech; repetition: subcortical
____________ paraphasias occur most frequently w/ subcortical aphasias
semantic
arguments FOR subcortical damage being an aphasia type
- abrupt onset
- acquired impairment of language
- symptoms can be associated with lesion site
arguments AGAINST subcortical damage being an aphasia type
- language deficits are mild compared to motor speech deficits
- language problems are more transient than in cortical aphasias, especially w/ thalamic damage
transient
temporary
auditory agnosia
difficulty recognizing auditory stimuli, although the same stimuli may be recognized in other modalities, even though hearing sensitivity is adequate
possible types of auditory agnosia
- amusia
- auditory sound
- pure word deafness
amusia
without music
auditory sound agnosia
cannot attach meaning to auditory stimuli (non-speech sounds)
pure word deafness
cannot recognize speech sounds
visual agnosia
impairment in the recognition of visual stimuli despite adequate visual sensitivity
possible types of visual agnosia
- prosopagnosia
- autopagnosia
- visual object agnosia
prosopagnosia
difficulty recognizing familiar faces
autopagnosia
difficulty recognizing body parts
visual object agnosia
difficulty recognizing actual or pictured objects
alexia
acquired reading deficit (input)
agraphia
acquired writing deficit (output)
difficulties decoding written text
alexia
PPA
primary progressive aphasia
PPA: primary
impairment is prominent in a single domain (language) with relative sparing of other domains early on (e.g., motor)
PPA: progressive
the impairment will get worse over time since it is caused by a neurodegenerative disease
PPA: aphasia
a language impairment
diagnostic criteria of PPA:
- min of 2 yrs of language decline
- prominent language deficits
- preservation of other mental functions
- independence in ADLs
- absence of apathy, disinhibition, forgetfulness of recent events, or visuospatial impairment
- exclusion of other causes of aphasia
- SLP & neuropsychological assessments concur w/ neurological exam
umbrella of neurodegenerative syndromes
dementia
condition, not diagnosis
dementia
clinical neurodegenerative dementia syndromes
- alzheimer’s dementia
- posterior cortical atrophy syndrome
- PPA
- behavioral variant frontotemporal dementia
Alzheimer’s dementia
amnestic dementia
posterior cortical atrophy syndrome
visuospatial dementia
occipital lobe
PPA type of dementia
aphasic dementia
behavioral variant frontotemporal dementia
(FTD)
aphasic dementia
right side
diagnosis of PPA:
- Hx from pt. & family + current meds
- neurological exam
- neuropsychological testing
- lab measures (blood tests, neuroimaging MRI, PET, LP)
PPA: pt typically reports that onset is
insidious (gradual)
PPA: pt. often presents many months/yrs after
onset of language difficulty
PPA: pt. usually notices problem before
SO
PPA: complaints are similar to
stroke-induced aphasia
PPA: pt. rarely denies deficit; is usually the one to
seek Dx & Tx
PPA: common feelings
frustration
reactive depression
PPA: clinical syndrome
progressive aphasia w/ relative sparing of other cognitive domains
PPA: neuroanatomic features
relatively focal atrophy w/in the left hemisphere language network
PPA: neuropathologic features
features associated w/ PPA are variable
3 types of PPA
- semantic variant
- logopenic variant
- nonfluent/ agrammatic variant
semantic variant PPA
PPA-S
similar to wernicke’s
preserved grammar
impaired word comprehension
logopenic variant PPA
PPA-L
similar to conduction or anomic aphasia
preserved grammar & word comprehension
impaired word finding/ retrieval & repetition
nonfluent/agrammatic PPA
PPA-G
similar to broca’s
impaired grammar
preserved word comprehension
PPA is a moving target:
- heterogeneity in progression rates and emergence of symptoms
- subtyping may not be feasible in the severe stages
PPA long-term prognosis
- after a time of 5-20 yrs after onset, other areas of the brain become affected
- along w/ language deficits, individual may demonstrate difficulty w/: memory, spatial abilities, attention, personality
- frustration & behavioral changes are common
- may compromise life-sustaining functions (e.g., swallowing)