Study Notes on Attention in Speech-Language Pathology

Introduction to Attention in Speech-Language Pathology

  • Interest in the cognitive skill of attention has increased significantly in the field of speech-language pathology over the past 2-3 decades.

  • Although attention is not specifically a language skill, it is a crucial cognitive process that interacts with language and communication.

  • Impairments in attention are observed in individuals with various neurologically acquired and degenerative conditions such as:

    • Stroke

    • Traumatic brain injury

    • Dementia

  • Attention deficits have been noted even in aphasia, which has traditionally been viewed as a language-specific impairment. This increasing interest is evident among researchers in communication sciences and disorders.

  • Clinicians treating cognitive communication disorders now routinely consider attention alongside cognitive-linguistic abilities.

Overview of Attention

Definition and Challenges

  • Defining attention is challenging due to its complexity and the variety of contexts it encompasses.

  • Everyday references to attention can vary: mentions of attention span, the action of paying attention, multitasking, and feelings of distraction.

  • Key questions about attention include:

    • Is attention a singular construct or multifaceted?

    • How can attention be measured?

    • How does attention integrate into the assessment and treatment of cognitive communication disorders?

Central Principles of Attention

  1. Attention Relational to Stimuli

    • Attention is always directed towards a stimulus, which can be:

      • External stimuli: e.g., sounds, images.

      • Internal stimuli: e.g., thoughts, memories.

  2. Modality of Stimuli

    • Attention can be directed to different modalities, such as:

      • Auditory: e.g., music

      • Visual: e.g., film

  3. Connection to Other Cognitive Processes

    • Attention is linked to memory and executive function. It is a prerequisite for successful cognitive-linguistic operations:

      • Example: You can't recall directions if you didn't pay attention when they were given.

  4. Capacity Limitation and Selection

    • Capacity Limitation: Humans can only process a limited number of stimuli simultaneously.

    • Selection: The system can focus on the most relevant stimuli while filtering out less important ones.

    • William James (1890/1950): "[Attention] is taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought."

Historical Models and Theories of Attention

  • Attention theories have evolved over the last several decades, often categorized into three groups:

    1. Selection Models: Explain how relevant stimuli are selected from the multitude of potential stimuli.

    2. Capacity Limitation Models: Discuss limits in attentional capacity.

    3. Subtypes of Attention Models: Classify different types of attention.

Models of Selection

  • Influenced by the “cocktail party problem”: the challenge of focusing on one conversation amidst noise.

    • Early Work:

    • Cherry (1953): Conducted experiments using dichotic listening tasks where listeners focus on one message while being unable to report information from the unattended message.

    • Broadbent (1952): Showed that confusion can occur even when stimuli do not overlap in time and frequency.

Major Theories of Selection

  1. Early Filter Theory (Broadbent, 1958)

    • Describes filtering out irrelevant stimuli early in processing.

  2. Filter Attenuation Model (Treisman, 1960)

    • Suggests that unselected stimuli are not completely filtered out but attenuated.

  3. Late Filter Model (Deutsch & Deutsch, 1963)

    • Proposes that all stimuli are analyzed initially, with selection happening later based on importance.

  4. Load Theory (Lavie, 1995)

    • Posits that the ability to ignore irrelevant stimuli depends on cognitive load.

Capacity Limitation Theories

  • Examined primarily through dual-task experiments where subjects manage multiple stimuli.

  • Resource Allocation Theory (Kahneman, 1973)

    • Suggests cognitive resources are flexibly allocated to tasks from a limited pool.

    • Observed that interference is greater when tasks share modalities (structural interference).

    • Conflicting theories propose multiple resource pools specialized for different cognitive domains.

Models of Attentional Subtypes

  • Models that differentiate types of attention have emerged prominently in research:

  1. Automatic vs. Controlled Processing (Schneider & Shiffrin, 1977)

    • Automatic processing occurs without attention; controlled processing requires capacity and is impacted by deficits.

  2. Posner and Petersen's Model (1990)

    • Identifies components of attention such as:

      • Orienting: Directing attention to a specific location.

      • Target Detection: Effortful control of attention.

      • Alertness: Preparing to process stimuli.

  3. Mirsky and Colleagues' Model (1991)

    • Classifies attention into four subtypes: focus, sustain, shift, and attention for outcomes.

Additional Concepts in Attention

  1. Variability: Attention can fluctuate based on distraction, fatigue, and individual differences. Older individuals show more variability.

  2. Effort: There is a critical interplay between attention and perceived effort. Kahneman (1973) suggests that both are closely related.

Attention in Neurogenic Cognitive Communication Disorders

  • Attention deficits manifest significantly in individuals with various neurologically acquired disorders, including:

    • Traumatic Brain Injury (TBI)

    • Aphasia

    • Dementia

  • The significance of these deficits creates a need for targeted assessment and treatment strategies.

Traumatic Brain Injury (TBI)

  • TBI encompasses a range of injuries with broad variability in cognitive impairments.

  • Research indicates frequent impairments in sustained attention among TBI patients.

  • Studies report conflicting data on the extent of attention deficits due to variability in patient presentation and differences in assessment approaches.

Aphasia

  • Aphasia is commonly associated with attention deficits that impact not only linguistic tasks but also general cognitive skills.

  • Research indicates that attention impairments in aphasia can be domain-general, affecting both language-based tasks and non-linguistic tasks.

Dementia

  • Attention impairments are prevalent across various forms of dementia, and the specific profile of these deficits can aid in differential diagnosis.

  • Attention fluctuations are particularly notable in Dementia with Lewy Bodies (DLB), whereas Alzheimer's disease typically sees progressive decline in attentional abilities.

Assessment of Attention

  • Successful assessment requires careful selection of tools valid for different types of attention depending on the patient’s context.

  • Important considerations include:

    • Patient's abilities and impairments.

    • Construct validity, ecological validity of tests.

    • Necessity for comprehensive assessment including multiple tools.

Tests of Attention

  • Widely recognized assessments such as:

    • Test of Everyday Attention (TEA)

    • Attention Process Training Test (APT-Test)

    • Digit Span Task

    • Brief Test of Attention (BTA)

    • Symbol Digit Modalities Test (SDMT)

    • **Paced Auditory Serial Addition Test (PASAT)

    • Conners Continuous Performance Test (CPT II)

    • Covert Orienting of Visual Attention (COVAT)

    • Sustained Attention to Response Test (SART)

    • Attention Network Test (ANT)

    • Rating scales like Moss Attention Rating Scale and Rating Scale of Attentional Behavior.

Treatment of Attention

  • Approaches to treatment often involve both restorative and compensatory strategies including direct attention training, skill training, environmental modifications, and self-management strategies.

Direct Training Approaches

  • Direct training approaches, such as the APT program can improve performance but may have variable generalizability to real-world tasks.

  • Computer-based programs are emerging as tools for direct training, although more evidence is needed to support their effectiveness conclusively.

Skill Training Approaches

  • Training focused on real-world tasks generally demonstrates better outcomes, teaching skills needed for daily life, such as activities of daily living (ADLs).

Compensatory Strategies

  • Emphasis on self-management strategies and environmental modifications to support attention maintenance in situational contexts.

Attention Treatments in Aphasia

  • Approaches to treating attention within aphasia frameworks include attentional training embedded in language therapy (L-SAT) and additional peer-reviewed studies focused on combining tasks to enhance attention through language engagement.

Case Study

  • A 69-year-old patient, KW, is assessed using attention-related tests to address attention deficits following TBI.

  • Initial goals may focus on improving the ability to manage medications, sustain conversation, and complete daily living tasks independently, using various support and aids.

Summary

  • Attention is an essential cognitive skill intertwined with multiple cognitive and communicative functions across various domains. It is crucial for clinicians to utilize evidence-based strategies to assess and treat attention deficits in individuals with cognitive communication disorders.

References

  • Comprehensive reference list provided in the original document, including studies, texts, and theoretical frameworks highlighted in the chapter.