Cognitive Psychology: Chapter 4 Attention Study Notes

Cognitive Psychology: Chapter 4 Attention

Contents

  1. What Is Attention? Overview & Importance

  2. Selective Attention: The Filter Problem

  3. Early Selection Models (Broadbent, Treisman)

  4. Late Selection Models (Deutsch & Deutsch, Norman)

  5. Attenuation Theory — The Compromise

  6. The Cocktail Party Effect

  7. Divided Attention

  8. Attention as a Resource — Capacity Models

  9. Automatic vs. Controlled Processing

  10. Visual Attention: Spotlight & Zoom Lens

  11. Feature Integration Theory (Treisman)

  12. Inattentional Blindness & Change Blindness

  13. Inhibition of Return

  14. Attention & Action: The SNARC and Related Effects

  15. Neuroscience of Attention

  16. Real-Life Applications of Attention Research

  17. Master Comparison Table & Exam Summary

What Is Attention? — Overview & Importance

Attention is defined as the concentration of mental activity. It involves two critical components: selectivity (the focus on certain stimuli while ignoring others) and capacity (a limited pool of mental resources available for allocation).
 
William James (1890) characterized attention as "the taking possession by the mind, in clear and vivid form, of one out of what seem several simultaneously possible objects or trains of thought." Attention allows the mind to focus and withdraw from various inputs, enabling effective engagement with selected stimuli.
 

Distinct Phenomena of Attention

  • Selective Attention: Focusing on one stimulus while ignoring others (e.g., a conversation in a noisy party).

  • Divided Attention: The attempt to attend to multiple stimuli simultaneously (e.g., driving while talking on the phone).

  • Sustained Attention (Vigilance): Maintaining attention over extended periods (e.g., a radar operator watching a screen).

  • Executive Attention: The high-level control of attention, linked to working memory and planning.
     
    The significance of attention lies in its role as a gatekeeper, filtering out irrelevant information amidst an overwhelming amount of stimuli which cannot all be processed deeply at once.

Classic Experiment: The Cocktail Party Problem

Cherry (1953) conducted the first major experiment on selective attention, known as the cocktail party phenomenon.

Experiment Setup

  • Method: Two different auditory messages were presented simultaneously to participants via headphones (dichotic listening). Participants were instructed to identify the target message.

Key Findings

  • Participants could separate overlapping messages using physical cues like voice pitch and speaking rate.

  • Unattended messages were almost entirely disregarded; participants retained minimal information (e.g., speech vs. noise, male vs. female voice).

  • They did not notice specific content or changes to the language used.

  • This established that the effectiveness of selective attention allows the mind to tune out irrelevant channels while raising questions about the mechanics of this process.

Selective Attention: The Filter Problem

The main question regarding selective attention is: How does the cognitive system selectively process relevant information from a vast amount of incoming stimuli?

The Dichotic Listening Paradigm

In this paradigm, participants use headphones to hear different messages in each ear. While repeating one of the messages aloud (shadowing), they must ignore the other.
 

Conclusions from Cherry's Work

Participants demonstrated selective attention effectively, noting only physical characteristics of the unattended messages without semantic processing.

Broadbent's Filter Model

Donald Broadbent's model (1958) is the first major information-processing model of selective attention.

Structure of the Model

  1. Sensory Buffer: All stimuli are briefly maintained (around 250 ms) in a parallel fashion before meaning is processed.

  2. Selective Filter: Information is filtered based solely on physical characteristics (e.g., location, pitch, loudness) rather than meaning.
       - This represents the early selection where filtering occurs before semantic analysis.

  3. Limited-Capacity Processor: Only the selected channel receives semantic processing; all else decays from the buffer.

Evidence Supporting Broadbent's Model

  • Cherry's findings align, showing unattended messages are typically not remembered.

  • Split-Span Experiments: Participants recalled digits by ear rather than in order of arrival, indicating attention operates at the ear/channel level.

Challenge to Broadbent's Model

Moray’s Experiment (1959)

  • Investigated the "Own-Name Effect" by demonstrating that participants sometimes noticed their name in the unattended channel, contradicting Broadbent's assertion that unattended content was never processed semantically.

Gray & Wedderburn (1960)

  • Conducted the Class-Inclusion Task to show that participants tended to recall messages based on their meaning across both channels, highlighting that semantic processing could occur without attention.
     

Attenuation Theory — The Theoretical Compromise

Treisman’s Attenuation Model

Anne Treisman refined Broadbent's model, indicating that the unattended channel is not entirely blocked but weakened.

  • Low-Threshold Activation: Some words (e.g., one's name, significant emotional stimuli) possess permanently low thresholds, allowing even attenuated signals to be perceived.

Implications

  • Treisman explained that the filter weakens the unattended signal instead of blocking it, making it possible for certain important messages to break through.

Late Selection Models (Deutsch & Deutsch, Norman)

Overview

  • These models suggest that all stimuli are fully analyzed before selection occurs. The selection process happens at the level of awareness, deciding what information enters into conscious experience and response generation.

Deutsch & Deutsch Model (1963)

  • They proposed that perception is not a bottleneck; everything is perceived, but only the most relevant information is acted upon.

Key Experiment — McKay (1973)

  • Explored semantic priming, where participants shadowed an ambiguous sentence while the unattended channel presented contextually related words, affecting later interpretation decision.

  • This illustrates late selection since it supports the idea that semantic processing occurs before conscious awareness.

Evidence for Late Selection

Conditioned GSR Experiment (Von Wright et al., 1975)

  • Paired words with mild shocks, resulting in physiological responses to those words in the unattended channel without awareness of their presence, suggesting full semantic processing occurred.

Attenuation Theory — The Theoretical Compromise

Summary

  • Attenuation theory serves as a blend of early and late selection theories, positing variable attenuation instead of an all-or-nothing approach.

The Cocktail Party Effect

This effect illustrates how individuals can focus on a single conversation amidst noise and also become aware of salient stimuli from unattended channels, revealing the dual nature of attentional focus.

Application

  • In audio engineering and hearing aids, designs utilize the cocktail party effect principles to enhance speech clarity from a specific direction through beam-forming technology.

Divided Attention

Explores whether humans can engage in multiple tasks simultaneously and under what conditions this is achievable.

Classic Experiment
Spelke, Hirst & Neisser (1976)

  • Participants practiced a dual task of reading and transcription, showing improved performance with practice, indicating that divided attention can be automated over time.

Real-Life Implications

  • Examples demonstrate that mobile phone use while driving significantly impairs driving performance, illustrating the limits of divided attention and the concept of inattentional blindness.

Kahneman's Central Capacity Model

  • Proposes a singular resource pool that varies with arousal (optimal at moderate levels), alongside multiple resource theories that delineate attention across specific processing modalities.

Automatic vs. Controlled Processing

These two types of processing differ significantly in resource demands and behavioral outcomes.

Features

  • Automatic Processing: Minimal resource demand, operates in parallel without awareness, developed through extensive practice. Examples include driving familiar routes.

  • Controlled Processing: Requires substantial resources, serial in nature, and based on awareness. Examples include learning new skills or solving complex problems.

Landmark Experiment
Schneider & Shiffrin (1977)

  • Demonstrated that automaticity develops with consistent practice, while varied mapping requires controlled processing, revealing critical distinctions between automatic and controlled processing.

Stroop Effect (1935)

  • Illustrates automatic processing interference through tasks like color-word naming (easy with congruence, slow with incongruence), emphasizing the endurance of automatic responses.

Visual Attention: Spotlight & Zoom Lens

Spotlight Model

  • Suggests that visual attention behaves as a spotlight that illuminates specific areas of the visual field, allowing detailed processing within the spotlight and less outside of it.

Zoom Lens Theory

  • Proposes variability in attention area coverage, supporting flexible allocation of attention based on task demands.

Key Experiment — Posner (1980)

  • Demonstrated covert attention directional benefits through spatial cuing, where valid cues improved processing speed at cued locations.

Feature Integration Theory (Treisman, 1980)

Two-Step Process

  1. Preattentive Feature Registration: Automatic and parallel processing of basic features without attention.

  2. Focused Attention — Feature Binding: Requires attentional focus to integrate features into single-object perception, explaining misconceptions such as illusory conjunctions.

Key Experiments
Feature vs. Conjunction Search

  • Highlight the differences in processing speed between preattentive feature searches and attentive conjunction searches.
     

Inattentional Blindness & Change Blindness

Inattentional Blindness

  • Describes failures to notice unexpected stimuli when attention is occupied elsewhere, exemplified by the "Invisible Gorilla" experiment (Simons & Chabris, 1999).

Change Blindness

  • Characterized by inability to detect changes in visual scenes, particularly during disruptions. This is showcased through the flicker paradigm and everyday examples that reveal the limits of visual encoding when attention is divided.

Real-Life Applications of Attention Research

  • Applications extend across various domains, including aviation safety, eyewitness testimony reliability, and medical imaging practices, where attentional principles enhance understanding and intervention strategies.

Inhibition of Return (IOR)

  • Describes a phenomenon where responses are slower to previously attended locations after a delay, reflecting an adaptive cognitive strategy to discourage revisiting inspected areas.

Neuroscience of Attention

Brain Areas Involved

Attention is managed by a network of brain regions:

  • Parietal Cortex: Key for directing spatial attention.

  • Frontal Eye Fields: Involved in planning and directing attention.

  • Anterior Cingulate Cortex: Activates during conflicts in responses.

Master Comparison Table & Exam Summary

Key Concepts in Attention

  1. Early Selection Models: Focus on physical features and filter information before semantic processing.

  2. Attenuation Theory: Suggests a weakening of the unattended signal rather than complete blocking.

  3. Late Selection Models: Propose all information is analyzed semantically; selection occurs post-analysis.

  4. Feature Integration Theory: Explains how attention is crucial for combining features into a single perceptual experience.

Exam Preparation Tips

  1. Clearly define key terms and concepts in responses.

  2. Reference essential experiments and their implications.

  3. Discuss real-world applications to showcase a deep understanding of concepts.

Key Researchers & Their Contributions

A summary of pivotal figures in attention research, detailing their contributions and the years of important studies, further consolidating knowledge for examination.

  • William James: Foundational ideas on attention (1890)

  • E. Colin Cherry: Dichotic listening, cocktail party problem (1953)

  • Donald Broadbent: Filter model of attention (1958)

  • Neville Moray: Own-name effect in unattended messages (1959)

  • Anne Treisman: Attenuation model and feature integration theory (1960s-1980s)

  • Deutsch & Deutsch: Late selection model (1963)

  • Daniel Kahneman: Capacity/resource theories of attention (1973)

  • Schneider & Shiffrin: Automatic vs. controlled processing studies (1977)

This comprehensive examination study guide encapsulates the intricate concepts surrounding attention in cognitive psychology. It offers a detailed framework for understanding both foundational theories and experimental evidence, furnished with practical implications and context of real-world applications.