Aphasia

Definition and Overview

• Aphasia is an acquired language disorder resulting from damage to brain areas responsible for language comprehension and production, primarily in the left hemisphere.

• It affects various aspects of language, including speaking, understanding, reading, and writing.

• Common causes include strokes, traumatic brain injuries, and neurodegenerative diseases.

• Aphasia can manifest in different forms, impacting individuals uniquely based on the location and extent of brain damage.

• Understanding aphasia is crucial for effective assessment and treatment in clinical settings.

Core Symptoms of Aphasia

• Decreased Fluency: Individuals may struggle to produce speech fluidly, often speaking in short phrases.

• Poor Auditory Comprehension: Difficulty understanding spoken language can hinder communication.

• Difficulty with Repetition: Challenges in repeating words or phrases can indicate specific types of aphasia.

• Anomia: Characterized by significant difficulty in word retrieval, leading to challenges in naming objects.

• Agrammatism: Involves difficulty forming complete sentences, often resulting in simplified speech.

Types of Aphasia

• Broca's Aphasia: Non-fluent output with limited speech production; individuals may understand language but struggle to express themselves.

• Wernicke's Aphasia: Fluent but nonsensical speech; individuals may have poor comprehension and produce irrelevant words.

• Global Aphasia: Severe impairment in all aspects of language; individuals may have very limited ability to communicate.

• Anomic Aphasia: Primarily characterized by difficulty in word retrieval, with relatively preserved comprehension and repetition.

Causes of Aphasia

• Stroke: The most common cause, which can be ischemic (blocked blood flow) or hemorrhagic (bleeding).

• Traumatic Brain Injury (TBI): Can lead to aphasia, especially when it affects language zones.

• Brain Tumors: Growths that may disrupt normal brain functions, including language.

• Neurodegenerative Diseases: Conditions like Alzheimer’s disease progressively impair language abilities.

Assessment and Outcome Measures

• Standardized Tests: Tools like the Boston Diagnostic Aphasia Examination (BDAE) and Western Aphasia Battery (WAB) evaluate language abilities.

• Psycholinguistic Assessments: Assessments like PALPA evaluate different language processes and guide treatment.

• Outcome Measure Assessments: Include scales like the Aphasia Severity Rating Scale and Communication Activities of Daily Living (CADL) to assess functional communication skills.

• Subjective Reports: Tools like SAQOL-39 and AIQ-21 assess the quality of life and impact of aphasia on daily living.

Frameworks for Understanding Aphasia

Theoretical Frameworks

• WHO-ICF: Focuses on functioning and disability, considering personal and environmental factors beyond the medical model.

• A-FROM: Emphasizes participation and quality of life for individuals with aphasia.

• C.A.P.E.: Stands for Connecting people, Augmentative and Alternative Communication (AAC), Partner Training, and Education and Resources.

• FOURC: Prioritizes client participation and functional outcomes in treatment.

Multilingualism and Cultural Aspects

• Strokes are prevalent in the Hispanic community and ethnic minority groups, highlighting the need for culturally sensitive approaches.

• Recovery may vary, with either or both languages potentially recovering post-stroke, depending on individual circumstances.

Neuroanatomy Related to Language

Central Nervous System vs Peripheral Nervous System

Classical vs Contemporary Views

• Classical View (Localist): Suggests specific brain areas are responsible for language functions (e.g., left hemisphere for language).

• Contemporary View (Connectionist): Proposes that language processing involves widespread brain networks, not confined to specific areas.

Components of the Brain Involved in Language

• Broca's Area: Located in the left frontal lobe, crucial for speech production.

• Wernicke's Area: Located in the left temporal lobe, essential for language comprehension.

• Arcuate Fasciculus: A bundle of nerve fibers connecting Broca's and Wernicke's areas, facilitating communication between them.

Understanding Stroke

Definition and Types of Stroke

• A stroke occurs when blood flow to a part of the brain is interrupted, leading to brain cell death.

• Ischemic Stroke: Accounts for 87% of strokes; caused by a clot blocking blood flow.

• Hemorrhagic Stroke: Accounts for 13% of strokes; occurs when a blood vessel in the brain ruptures.

Impact of Stroke on Language

• Strokes can lead to various types of aphasia, depending on the affected brain regions.

• Recovery from stroke-related aphasia can vary widely among individuals, influenced by factors such as age, health, and rehabilitation efforts.

Definition and Causes

• Stroke occurs when blood flow to the brain is interrupted, leading to brain cell death.

• Can be caused by plaque buildup in blood vessels, leading to ischemic strokes.

• Hemorrhagic strokes occur due to bleeding in the brain, often from ruptured blood vessels.

Symptoms of Stroke

• Sudden numbness or weakness, particularly on one side of the body.

• Confusion, trouble speaking, or understanding speech.

• Vision problems, such as loss of vision or dimming in one or both eyes.

• Severe headache with no known cause, often described as the 'worst headache of my life'.

• Loss of balance or coordination, typically accompanied by other symptoms.

Risk Factors

• Hypertension: High blood pressure increases the risk of stroke.

• Smoking: Contributes to vascular damage and plaque buildup.

• Diabetes: Affects blood sugar levels and can damage blood vessels.

• High cholesterol: Leads to plaque formation in arteries.

• Obesity and atrial fibrillation: Both increase the likelihood of stroke occurrence.

Diagnostic Techniques

• CT Scan: First-line imaging to quickly identify bleeding or swelling in the brain.

• MRI: Provides detailed images of brain structures and can identify ischemic areas.

• Post-mortem examinations: Help correlate clinical symptoms with brain pathology.

Treatment Options

• Ischemic Stroke: Treatment includes tPA (tissue Plasminogen Activator) within a 4-hour window.

• Thrombectomy: A procedure to remove large blood clots from the brain.

• Hemorrhagic Stroke: May require surgical intervention to repair blood vessels or relieve pressure.

Neuroplasticity and Rehabilitation

Concept of Neuroplasticity

• Neuroplasticity refers to the brain's ability to reorganize itself by forming new neural connections.

• It is crucial for recovery after brain injuries, including strokes.

• Improvement in neuroplasticity can be achieved through repetitive practice and frequency of tasks.

Future Prospects in Brain Imaging

• Combining neuroimaging with brain mapping techniques to assess recovery in conditions like aphasia.

• Potential to visualize active brain areas during rehabilitation, enhancing targeted therapies.

Aphasia and Language Disorders

Types of Aphasia

• Broca's Aphasia: Non-fluent speech with good comprehension; difficulty in word production.

• Wernicke's Aphasia: Fluent but nonsensical speech; poor comprehension.

• Global Aphasia: Severe impairment in both comprehension and production of language.

Diagnostic Classification

Paraphasic Errors

• Phonemic Paraphasia: Substituting similar-sounding words (e.g., 'kammick' for 'comic').

• Semantic Paraphasia: Substituting words with similar meanings (e.g., 'cot' for 'bed').

• Neologistic Paraphasia: Creating nonsensical words (e.g., 'sklervick').

Sensory Changes and Other Neurological Conditions

Sensory Changes Post-Stroke

• Vision: Blurred vision, double vision, or loss of sight.

• Smell: Anosmia (loss of smell) or hyperosmia (increased sensitivity to smells).

• Touch: Numbness, pins and needles, or hypersensitivity.

General Knowledge of Brain Conditions

• Headache: Common symptom, can indicate various conditions.

• Brain Aneurysm: Weakness in blood vessel walls, risk of rupture.

• Concussion: Traumatic brain injury affecting cognitive function

Sensory changes in stroke

• Vision or sight

  • Blurred vision

    • Double vision

    • Blind spots

    • One side neglect

  • Smell

  • Loss of ability to smell (anosmia)

    • Overlay sensitive to smells (hyperosmia)

  • Taste

  • food/drink has different or bad taste

    • Inability to taste flavors

  • Touch

  • Difficulty feeling touch, pain, temperature

    • Numbness or pins and needles

    • Prickling, burning, hypersensitivity

  • Hearing

  • Auditory pathway, reception and understanding information

    • True hearing loss only with a brain stem stroke

Neuropathology of Language:

8 types of cortical aphasia

• Broca’s

  • TMA

  • Global

  • Isolation

  • Wernicke's

  • TSA

  • Conduction

  • Anomic

• Broca's Aphasia: Characterized by non-fluent, effortful speech with good comprehension; individuals struggle to produce words .Short phrases 

• Wernicke's Aphasia: Marked by fluent speech that lacks meaning, with poor comprehension and production of nonsensical phrases.

• Global Aphasia: Characterized by poor fluency, comprehension, and repetition

• Integrative model of brain-language relations

• proposes that language processing involves multiple interconnected and overlapping brain systems, including both nearby and distant cortical and subcortical regions. These systems work together, allowing for both localized and widely distributed processing of language. The "zone of language" acts as a central hub for integrating language elements, and damage to this area can lead to predictable language deficits like aphasia.

Diagnostic and Classification of Aphasia:

• -Boston Classification System/can you fill in the chart?

• Nonfluent: B, TMA, G, I

  • Fluent: W, TSA, C, A

• Anomia and the different types of naming 

• Generative

  • Responsive

  • Confrontation

• 3 Steps in classifying aphasia and how to execute each step

• 1. Fluency

  • 2. Comprehension

  • 3. Repetition 

• Types of paraphasia errors

• Uninformative statement

  • Ex: its one of those things you see

  • Informative circumlocutions

  • Ex: you lay on it outside

  • Phonemic paraphasia

  • Its a kammick

  • Semantic paraphasia

  • Its a cot

  • Neologistic paraphasia

  • Its a sklervick

  • Perseveration

  • Its a harp (previous BNT item)

• What is disempowering language?

• Process Approach

• Based on the idea that reliance on test scores often obscure critical information about individual differences in cognitive styles and strategies, preserved abilities, and the way in which a task was passed or failed

  • Applying the process approach to the quantitative exam helps us obtain critical information about adaptive and maladaptive behaviors, as well as problems solving strategies 

• -What does a clinician with an observational mindset look like?

• perspective where the therapist or clinician closely monitors and analyzes a person's behaviors, strategies, and responses during therapeutic activities

Assessment of Alexia and Agraphia (Chapter 10)

• = symbolic skulls built on knowledge of spoken language. Reading relies on visual system alone. Writing requires both motor-kinesthetic and visual system. 

• Alexia = reading disorder caused by brain damage

• Agraphia = witing disorder caused by brain damage

• -which systems are required for each?

Apraxia

• = disturbed ability to produce learned, purposeful movements despite intact mobility, usually as a result of left hemisphere damage

• 4 general types

• Limb apraxia

  • Transitive -pretend tool,  trying to unlock door with key

    • Intransitive - no tool, waving goodbye

  • Ideational apraxia

  • Ideomotor 

  • Apraxia of speech

Identity and Aphasia

• Quality of life and identity are linked

• People need people to renegotiate identity and for identity to be authenticated 

• Conversation affirms identity 

• Social Model

• What are the primary goals of social model?

  • Functional communication methods

    • Life participation

    • Communication partners

    • Acknowledging competence

  • “Primary goals are transaction and interaction, the medium is conversation” 

  • Social model applies better to aphasia than traditional model 

Clinical Tips from all powerpoints thus far

• Education before remediation (ALWAYS)

• Verbal Fluency Assessment (generative naming, divergent naming, divergent classification) - tells you how someone's language is

• Listen to the patient when they’re talking

• Know the test before you give it and give it in the way it is instructed