chapter 2 Flashcards
Recent evidence of cerebral dominance says….
both hemipsheres contribute to language and non-language functions
left hemisphere dominance
approx. 95% of right handed people & 70% of left handed people are left hemisphere dominant
bilateral dominance
approx. 25-30%
right hemisphere dominance
5%
recent view of lang. functions
different neural networks control different functions meaning all structures work together
broad classifications of aphasia
nonfluent, fluent, subcortical, mixed
nonfluent aphasia are characterized by
relatively good auditory comprehension and deficits in lang expression; broca’s, transcortical motor, global
fluent aphasia are characterized by
relatively fluent speech with deficits in auditory comprehension;wernicke’s, conduction, anomic, transcortical sensory
subcortical aphasias are characterized by
borderline aphasias; deficits in both expression and comprehension but severity varies.
mixed aphasias
presence of 2+ aphasias at same time
lesions limited to Broca’s area can have what deficits?
mild deficits in prosody, mild agraphia with occasional anomia; dysarthria
aphemia (broca’s)
unable to articulate words BUT can comprehend and write
Broca’s aphasia is a nonfluent type of aphasia with
deficits in language expression and relatively intact comprehension
transcortical motor aphasia - most commonly affected areas
supplementary motor cortex and areas connecting Broca’s area
transcortical motor aphasia - most commonly affected blood supply
-anterior cerebral artery
-anterior branches of middle cerebral artery
transcortical motor aphasia is a non-fluent type of aphasia with
intact repeitition skills
global aphasia - most commonly affected areas
lesions affecting both divisions of MCA and left fronto-parieto-temporal regions (including zone of language)
global aphasia
most severe form of aphasia with a generalized effect on communication skills, deficits in both comprehension and expression
wernickes aphasia - most commonly affected areas
posterior 3rd of superior-temporal gyrus (near wernicke’s area)
wernickes aphasia - when it effects the primary temporal lobe lesions will result in…
deficits in understanding indvidual, isolated spoken words but can understand words with context (in a sentence)
wernickes aphasia - when it effects the posterior temporal lobe lesions will result in more….
more changes in vision, more deficits in written language, less in language comprehension
wernicke’s aphasia
fluent type of aphasia with poor comprehension
conduction aphasia - most commonly affected areas
supramarginal gyrus, underlying white matter pathways, wernicke’s area, left insula, and auditory cortex