Notes on Wexler Adult Intelligence Scale (WAIS)

Introduction

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Overview of WAIS

• WAIS: Wexler Adult Intelligence Scale
• Developed by psychologist David Wexler.
• Measures cognitive abilities and intelligence in adults.

Current Version

• Fourth Edition (WAIS-IV)
  • Includes 10 core subtests and 5 supplemental subtests.
  • Assesses intelligence through four major index scores.

Major Index Scores

1. Verbal Comprehension Index (VCI)

   • Measures:
     • Verbal reasoning
     • Comprehension
     • Conceptual abilities
   • Core subtests:
     • Similarities
     • Vocabulary
     • Information

2. Perceptual Reasoning Index (PRI)

   • Measures:
     • Nonverbal reasoning
     • Spatial processing
     • Visual-motor integration
   • Core subtests:
     • Block Design
     • Matrix Reasoning
     • Visual Puzzles

3. Working Memory Index (WMI)

   • Assesses:
     • Ability to store and manipulate information in short-term memory
   • Core subtests:
     • Digit Span
     • Arithmetic

4. Processing Speed Index (PSI)

   • Measures:
     • Speed and accuracy of visual information processing
   • Core subtests:
     • Coding
     • Symbol Search

Core Subtests

• Similarities: Verbal concept formation and reasoning.
• Vocabulary: Assesses word knowledge and comprehension.
• Information: Evaluates general knowledge and long-term memory.
• Block Design: Measures spatial perception and visual-motor coordination.
• Matrix Reasoning: Assesses non-verbal abstract reasoning.
• Visual Puzzles: Evaluates nonverbal reasoning and visual processing.
• Digit Span: Measures auditory short-term memory and concentration.
• Arithmetic: Assesses numerical reasoning and mental manipulation.
• Coding: Measures processing speed and visual-motor coordination.
• Symbol Search: Evaluates processing speed and visual perception.

Supplemental Subtests

1. Figure Weights: Quantitative and analogical reasoning.
2. Comprehension: Social judgment and common sense reasoning.
3. Letter-Number Sequencing: Working memory and attention.
4. Cancellation: Processing speed and visual attention.
5. Picture Completion: Visual perception and recognition.

Scoring System

• Comprehensive assessment with:
  • Four main index scores
  • Full scale IQ score: Overall intellectual ability.
• Standard scoring scale:
  • Mean: 100
  • Standard deviation: 15
  • Average scores: 85-115
  • Above average: Above 115
  • Below average: Below 85
• Composite scores for specific cognitive domains and subtest scale scores available.

Practical Application

• Sample of WAIS scale for practical usage in assessments.
• Exploring the templates library on the Care Patron website for free templates.

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Closing Remarks

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