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The Intellectual Profile of Adults with Specific Learning Disabilities.

Eleonora Pizzigallo1, Cesare Cornoldi1, Serafino Buono2

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Summary

Adults with specific learning disabilities (SLDs) show higher reasoning (General Ability Index, GAI) and lower working memory/processing speed scores, similar to children. The IQ-GAI gap effectively identifies SLDs in adults.

Keywords:
adults with SLDintelligenceprocessing speedworking memory

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Area of Science:

  • Neuropsychology
  • Educational Psychology
  • Cognitive Science

Background:

  • Specific learning disabilities (SLDs) impact intellectual profiles, yet adult research is limited.
  • Understanding the cognitive strengths and weaknesses in adults with SLDs is crucial for targeted interventions.

Purpose of the Study:

  • To investigate the intellectual profile of adults with SLDs using the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV).
  • To compare the intellectual profile of adults with SLDs to that of children with SLDs.
  • To assess the diagnostic utility of the discrepancy between Full-Scale IQ and the General Ability Index (GAI) in adults with SLDs.

Main Methods:

  • Administered the Wechsler Adult Intelligence Scale-Fourth Edition (WAIS-IV) to 301 adults diagnosed with SLDs.
  • Compared results to previous studies on children with SLDs.
  • Analyzed the factor structure of intelligence in adults with SLDs.

Main Results:

  • Adults with SLDs exhibited higher General Ability Index (GAI) scores (reasoning) and lower scores in working memory and processing speed, mirroring patterns in children.
  • The difference between Full-Scale IQ and GAI effectively discriminated adults with and without SLDs.
  • The proposed four-factor intelligence structure was generally applicable, but a five-factor structure might be more suitable due to differing factor loadings.
  • Adults with SLDs generally scored lower than children on subtests, especially in working memory and processing speed, accentuating the IQ-GAI discrepancy.

Conclusions:

  • The intellectual profile of adults with SLDs shares similarities with children but presents distinct differences, particularly in overall score levels.
  • The GAI serves as a valuable indicator of cognitive strengths in adults with SLDs.
  • The IQ-GAI discrepancy is a significant marker for identifying SLDs in adults.