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104 terms

Aphasia

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Aphasia
an acquired communication disorder caused by brain damage, characterized by an impairment of language modalities: speaking, listening, reading and writing
-is neurogenic
-acquired
-not a problem of sensation or intellect
Prevalence & Incidence
-over 1 million Americans have aphasia
-more than 100,000 new cases of aphasia annually
-aging of the US population (1/250 people)
Localization
Phrenology
-Gall believed that brain is a collection of separate organs, each governing a distinct mental faculty, with the parts of the brain at the surface playing a crucial role
Paul Broca
-Broca's area: premotor cortex, speech programming and planning
Carl Wernicke
-"sensory aphasia" impaired language comprehension due to damage to posterior region of brain
-Wernickes area-auditory association area, mental lexicon, grammatical rules
Anti-localization
-scientists that don't like to give brain structures specific function
-Flourens, Jackson, Pierre Marie
-the brain operates as an integrated whole
-the new localizationists were right somewhat more often than they were wrong
Language and Cerebral Dominance
-most adults: L hem for language
-some left-handers: more flexible about which hemisphere responsible for language
-less severe aphasia and recover better
Perisylvian Region
-the region surrounding the Sylvian fissure in the left hemisphere
-anterior language zone
-posterior language zone
-arcuate fasciculus and angular gyrus
Anterior Language Zone
-Perysylvian region in the L frontal lobe
-Broca's area: posterior inferior L frontal lobe
-function: planning and organizing expressive language actions (speech, writing and perhaps gestures)
Posterior Language Zone
-Perysylvian region in the L temporal love and in the L parietal lobe
-Wernicke's area: in the posterior superior superior left temporal lobe
-function: comprehending linguistic materials (store and retrieve mental representation of words
-formulating linguistic info with appropriate syntax and semantics
-interpreting info & help format new messages as well
Arcuate Fasciculus & Angular Gyrus
-arcuate fasciculus: linguistic info formulated in Wernickes area-->Broca's area
-angular gyrus (part of inferior parietal lobe) at the junction of temporal, parietal and occipital lobes
-reading (alexia) and writing (agraphia)
Impairments of Aphasia
-language comprehension
-spontaneous speech
-repetition
-reading
-writing
Auditory Comprehension
-How do spoken messages conduct?
-a spoken message (auditory output)
-Primary auditory cortices (L&R): acoustic info
-Wernickes area in left hemisphere (maps meaning onto speech signal and select vocab and syntax from memory
*R hemisphere consultation to interpret message intent
Spontaneous Speech
-Wernickes area
-Arcuate fasiculus
-Broca's area (speech programming) to primary motor cortex (execution of speech program)
-pyramidal system (corticobulbar tract) to cranial nerves (5,7,9,10,12 for speech muscles)
-Wernickes area and frontal love monitor speech output and repair speech errors (self-monitoring skills)
Repetition
-test entire language circuit
-acoustic info to primary auditory cortex (encoding)
-Wernickes area (encoding)
-arcuate fasciculus
-Brocas area to primary motor cortex
-Primary motor cortex to cranial nerves
-Wernickes area and frontal lobe monitor speech output and repair speech errors
Reading Comprehension
-printed materials
-visual cortices (if in RH, passing through corpus callosum) into LH
-Wernickes area (Client able to interpret linguistic info?)
Writing
-Wernickes area (formulate a message)
-arcuate fasciculus
-premotor cortex for hand and arm
-primary motor cortex for hand and arm
-pyramidal tract (corticospinal) for hand and arm
-Eyes and Wernickes area continue to edit and repair the written messages
Expressive vs. receptive
Brocas vs. Wernickes
Anterior vs. Posterior
(brain lesion) Brocas vs. Wernickes
Motor vs. Sensory
Brocas vs. Wernickes
Fluent vs. Nonfluent
Wernickes vs. Brocas
Non-fluent Aphasia Types
-Brocas
-Global
-Transcortical Motor Aphasia (TMA)
Fluent Aphasia Types
-Wernickes
-Conduction
-Transcortical sensory aphasia (TSA)
-Anomic aphasia, alexia, agraphia, agnosia, AOS, Dysarthria
Broca's Aphasia
-(nonfluent)
-lesion location: posterior-inferior frontal gyrus of the left hemisphere
-expressive aphasia, anterior aphasia, motor aphasia,
-right sided hemiparesis of hemiplegia
-if no paresis, more local damage toward bottom of motor cortex
Comprehension (Brocas)
-fair-good, difficulty in understanding complex syntactic structures
Speech (Brocas)
-telegraphic (use of primarily nouns and verbs), limited word output, short phrases and sentences, monotonous, apraxia of speech, dysarthria
Repetition (Brocas)
-labored, misarticulated, telegraphic (omits the grammatical elements of a sentence)
Fluency (Brocas)
-nonfluent, effortful, slow, halting
Word-retrieval (Brocas)
-impaired
Reading (Brocas)
-fair, slow reader
Writing (Brocas)
-at least as severely impaired as speech
Self-awareness (Brocas)
-aware of communication deficits
Global Aphasia
-(nonfluent)
-lesion location: large, perisylvian, widespread, destruction of the front-temporo-parietal regions
Comprehension (Global)
-poor
Speech (Global)
-profoundly impaired, stereotypic utterances
Repetition (Global)
-poor, literal and verbal paraphasias, perseveration
Fluency (Global)
-nonfluent
Word Retrieval (Global)
-poor
Reading & Writing (Global)
-impaired
Self-awareness (Global)
-poor
Stereotypic utterances
-repetitive utterances produced during an attempt to speak
-single, multiple or repeated syllables
-"hu hu" "kakie-kakie-kakie"
-Real words or phrases not related to context
-"it's a go-go"
-"how-dee-do"
Literal (phonemic) paraphasia
-incorrect sounds replace correct sounds (sound substitutions within words) "shooshbrush for toothbrush"
Verbal (semantic) paraphasia
-substitute one word to another
-pt. says "TV" for "book" or "fork" for "spoon"
Transcortical Motor Aphasia
-(nonfluent)
-lesion location: anterior superior frontal lobe in the language dominant hemisphere
-lesion at top of primary motor cortex, located higher than brocas lesion
Comprehension (TMA)
-Good
Speech (TMA)
-limited spontaneous speech, halting, agrammatic
Repetition (TMA)
-important to note
-preserved, echolalia, delayed in initiation
Fluency (TMA)
-reduced speech rate, nonfluent with some fluent utterances, unusual delays in inhibition
Word retrieval (TMA)
-variable, with delays in initiation
Reading (TMA)
-Good
Writing (TMA)
-Impaired
Wernicke's Aphasia
-lesion location: posterior superior temporal lobe
-receptive aphasia, posterior aphasia, sensory aphasia
Comprehension (Wern)
-poor
Speech (Wern)
-intact grammatical structures
-literal (phonemic) and verbal (semantic) paraphasias
-neologism, jargon-unintelligable speech.
-Think they make sense, no self awareness
Repetition (Wern)
-fluent, with verbal (semantic) paraphasias
Fluency (Wern)
-fluent, empty
Word-retrieval (Wern)
-poor, circumlocution, with verbal (semantic) paraphasias
Reading (Wern)
-difficulty recognizing meanings of printed words and sounds associated with written words
Writing (Wern)
-excessive but meaningless writing, fluent misspellings, and neologistic writing
Neologism
-production of nonsense words, usually without recognition of error
-impaired areas: lexical access to the word, semantic representation of the word, phonologic processing
-follow rules of language: stress, syllable structure, phonological rules
-speech that consists primarily of neologisms is called jargon
-Example: "Pass me the torkin" (salt)
-Aperam, unporter the merk so inper orzip"
Conduction Aphasia
-(fluent)
-lesion location: upper temporal lobe
-lower parietal lobe
-arcuate fasciculus
Comprehension (conduction)
-fair to good
Speech (conduction)
-literal (phonemic) paraphasias
Repetition (conduction)
-important to note
-impairment in the repetition of function words, longer words and longer phrases and sentences
-cannot repeat words
Fluency (conduction)
-fluent, less fluent than wernickes
Word retrieval (conduction)
-fair
Writing (conduction)
-impaired for most cases
Reading (conduction)
-variable reading problems
Self-awareness (conduction)
-alert, long strings of unsuccessful repair attempts
Transcortical Sensory Aphasia (TSA)
-(fluent)
-lesion location: posterior parietal lobe and parieto-occipital regions
Comprehension (TSA)
-generally poor. difficulty in following directions or answering simple yes/no questions
Speech (TSA)
-varies. spontaneous speech contains many paraphasias and neologisms, normal automatic speech (ex. counting)
Repetition (TSA)
-important to note
-intact repetition ability, echolalia and perseveration. pt. may offer an echo to long instructions provided by the clinician.
Fluency (TSA)
-fluent, empty
Word-Retrieval (TSA)
-poor
Writing (TSA)
-impaired
Reading (TSA)
-poor
Anomic Aphasia
-lesion location: varies. Appears as a result of diverse causes
-inferior temporal lobe is often involved
Comprehension (anomic)
-good. comprehension of complex and lengthy material may be compromised
Speech (anomic)
-empty speech, word retreival difficulties
Repetition (anomic)
-intact
Fluency (anomic)
-fluent
Word Retrieval (anomic)
-is the distinguishing feature from conduction aphasia
-pervasive word-finding difficulty, circumlocution, intact pointing to named objects
Reading and Writing (anomic)
-normal
Alexia
-the loss of previously acquired reading skills due to recent brain damage
-A=complete loss of an ability
Dyslexia
-a difficulty in learning to read
-2 types
Surface dyslexia
-rely on letter by letter decoding
-able to read regularly spelled words (radio, cap, hand)
-misread irregulary spelled words (neighbor)
Deep dyslexia
-rely on whole-word recognition
-misread words represent semantic errors (chair for table) or morphological errors (steal for stealth)
Alexia
-the loss or impairment of normally acquired reading skills
Agnosia
-impaired understanding of the meaning of certain stimuli
-often limited to one sensory modality
-no peripheral sensory impairment
-2 types
Auditory Agnosia
-bilateral damage to the auditory association areas
-normal peripheral hearing
-impaired understanding of the meaning of auditory stimuli
Auditory Verbal Agnosia
-(pure word deafness)
-bilateral temporal lobe lesions which isolate wernickes area
-normal peripheral hearing
-impaired understanding of spoken words
-pt. comprehends meanings of words in printed or written forms
Direct Reading Route
-whole word (visual representation of a word)
-familiar words usually processed through this route
Indirect Reading Route
-uses phonological analysis
-examples: chomps, toughfs, spemmed
Apraxia
-a disorder of volitional movement in the absence of muscle weakness, paralysis, or fatigue
Apraxia of speech (AOS)
-impairment with planning and programming for positioning and sequentially moving muscles for the volitional production of speech
-NOT caused by muscle weakness or neuromuscular slowness
-lesion: damage or injury to speech-motor programming areas (Brocas area and insula) in the dominant hemisphere
Characteristics of AOS
-INCONSISTENT articulation errors
-sound substitutions most common, distortions, and omissions
-more pronounced difficulty with consonants than vowels
-placement errors>voicing, manner (africates, fricatives are difficult), resonance
-easier automatic productions than volitional/purposive productions
-groping and silent posturing
-slower rate of speech, delayed initiation of speech, innappropriate pausing during speech
-less noticable stress patterns
-general awareness of speech problems
Dysarthria
-a neological speech motor impairment characterized by slow, weak, imprecise and/or uncoordinated movements of the speech musculature
-involving peripheral or CNS pathology (cerebral paulsy, stroke, traumatic brain injury, tumors, MS, Parkinsons)
Characteristics of Dysarthria
-respiratory, articulatory, phonatory, resonatory and prosodic disturbances caused by weakness, incoordination or paralysis of speech musculature
*CONSISTENT errors
Perseveration
-3 types
-inappropriate repetition or continuation of an earlier response after task requirements have changed
-person gets stuck on certain task
-could snowball through testing
Variables of perseveration
-nature of the task: intentional tasks difficult, automatic tasks less troublesome)
-order of tasks: "tell me names of fruits, tell me names of veggies" too similar
-rate of stimulus presentation (likely to occur if tasks presented too fast)
-word frequency(low frequency words difficult)
-semantic and phonemic relatedness (fork/spoon, too, two, to) Target words must sound and look different
Stuck-in-set perseveration
-inappropriate maintenance of a framework of response after introduction of a new task
-Example: 1st task, asked to draw. 2nd, write what you see..pt. began drawing.
Continuous perseveration
-inappropriate prolongation or continuation of a behavior without intervening response or stimulus
-Example: draw clock, draw long hand. pt. continued to draw lines over and over (w/o being intervened)
Recurrent perseveration
-inappropriate recurrence of a previous response following presentation of a new stimulus or after giving a different intervening response
-Example: naming task: 1. watch 2. gun "shot, oh, wrist, no" 3. Key 4. Jack "key" continues saying "key" for tasks