Intellectual and Neuropsychological Assessment Notes

Intellectual and Neuropsychological Assessment Notes

Essential Qualities of Assessment Techniques

  • All assessment techniques, including interviews, must have:
    • Validity: Measures the intended constructs accurately.
    • Types of validity:
      • Content Validity: Ensures content is appropriate for what's measured.
      • Convergent Validity: Correlates with other techniques assessing the same construct.
      • Discriminant Validity: Shows no correlation with techniques measuring different constructs.
    • Reliability: Produces consistent and repeatable results.
    • Types of reliability:
      • Test-Retest Reliability: Similar results when administered at different times.
      • Interrater Reliability: Similar results across different administrators.
      • Internal Reliability: Items within the test are consistent with one another.
    • Clinical Utility: Enhances service delivery or client outcomes.

Feedback in Assessment

  • Integral to psychological assessments.
  • Involves sharing findings from tests or interviews, could be:
    • Face-to-face discussions
    • Written reports
  • Typically provided after the initial client meeting (intake).

Overview of Assessment Types

  • Assessments in this module relate to cognitive functioning:
    • Intelligence Tests: Measure intellectual capabilities.
    • Achievement Tests: Gauge accomplishments in academic areas.
    • Neuropsychological Tests: Focus on cognitive dysfunction due to brain injuries or illnesses.

Theories of Intelligence

  • Central Question: Is intelligence a singular quality or a collection of distinct abilities?
    • Charles Spearman: Proposed a general intelligence ('g').
    • Louis Thurstone: Advocated for multiple, unrelated abilities.
    • Hierarchical Models: Combine elements of both singular and plural perspectives.

Contemporary Theories of Intelligence

  • James Cattell:
    • Proposed two intelligences:
    • Fluid Intelligence: Reasoning in novel problem situations.
    • Crystallized Intelligence: Knowledge gained from life experiences.
  • John Carroll: Introduced the three-stratum theory consisting of:
    • A general intelligence factor ('g')
    • Eight broad factors
    • Sixty specific abilities.

Wechsler Intelligence Tests

  • Developed by David Wechsler in early 1900s. Three main versions currently:
    • WAIS-IV: Ages 16-89
    • WISC-V: Ages 6-16
    • WPPSI-IV: Ages 2-7
  • Common Features:
    • Single full-scale IQ score plus four index scores:
    • Verbal Comprehension
    • Perceptual Reasoning
    • Working Memory
    • Processing Speed
    • Standard results: Mean of 100 with SD of 15, detailed subtest scores for comprehensive assessment.

Stanford-Binet Intelligence Scales—5th Edition (SB5)

  • Historically dominated until Wechsler's tests.
  • Features:
    • One comprehensive test that spans ages 2-85+
    • Similar to Wechsler in generating an overall IQ score and factor scores but with different subtests and factors.

Cultural Fairness in Intelligence Tests

  • Awareness of cultural biases, especially in verbal assessments.
  • Improvement in both Wechsler and Stanford-Binet tests to enhance fairness.
  • Universal Nonverbal Intelligence Test-2 (UNIT-2): Language-free, uses gestures for instructions and responses; however, limited range and psychometric data.

Achievement Testing

  • Distinguishes between intelligence (capability) and achievement (actual performance).
  • Typically generates standard scores comparable to intelligence tests (mean = 100).
  • A significant gap between achievement and expected levels indicates specific learning disorders.
  • Wide range of tests, such as Wechsler Individual Achievement Test—Third Edition (WIAT-III) for various academic skills.

Neuropsychological Testing

  • Assesses cognitive functioning related to brain impairments or dysfunction.
  • Utilized for rehabilitation planning, eligibility for accommodations, and post-injury assessments.
  • Tests can be comprehensive or focused.
Halstead-Reitan Neuropsychological Battery (HRB)
  • A comprehensive evaluation consisting of 8 tests aimed at identifying brain damage—analyzes various sensory and cognitive functions.
  • Luria-Nebraska Neuropsychological Battery (LNNB): Another comprehensive test similar to HRB focusing on qualitative data.
Brief Neuropsychological Measures
  • Bender Visual-Motor Gestalt Test: A widely-used screen involving geometric designs; suggests possible brain damage.
  • Rey-Osterrieth Complex Figure Test: Involves a complex figure for drawing and recalling from memory.
  • Wechsler Memory Scale—Fourth Edition (WMS-IV): Assesses memory problems due to various causes, focusing on auditory/visual memory and recall.
Trail Making Tests
  • Used to evaluate cognitive flexibility and processing speed.
  • Part A: Connects numbers sequentially; Part B: A shifting task that requires alternating between numbers and letters.