can iq change in adults

Introduction

The question of whether IQ can change in adults is a topic of significant interest in the fields of psychology and neuroscience. While IQ is often considered stable over the lifespan, recent research suggests that various factors, including brain development, mental health, and life circumstances, can influence changes in IQ.

Key Insights

IQ Stability and Brain Development:
- IQ can change during the teenage years, with fluctuations in verbal and non-verbal IQ closely linked to changes in brain structure.
IQ and Mental Health:
- IQ can predict outcomes in adult psychiatric patients, with higher IQ associated with better symptom outcomes over a two-year period.
IQ in Special Populations:
- In institutionalized mentally retarded individuals, slight increases in IQ were observed, particularly in performance IQ, challenging the notion that IQ decreases with age.
Long-term IQ Stability:
- For most individuals with autism who had an average IQ in childhood, IQ remained stable into mid-to-late adulthood. However, a significant minority experienced severe declines in functional ability due to behavioral and neurological issues.

Conclusion

While IQ is generally stable in adulthood, it can change under certain conditions. Brain development during teenage years, mental health status, and specific life circumstances can influence IQ. In special populations, such as those with autism or mental retardation, IQ may show slight increases or remain stable, although severe behavioral or neurological issues can lead to declines in functional ability.

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Can iq change in adults

Summary

Introduction

Key Insights

Conclusion

Sources and full results

Verbal and nonverbal intelligence changes in the teenage brain

Verbal and non-verbal IQ can rise or fall in the teenage years, with changes in brain structure correlating to these changes in performance.

IQ as a prognostic indicator in adult psychiatric first-admissions.

IQ is a significant predictor of improvement in adult psychiatric first-admissions over a 2-year period, particularly for those with non-average IQ scores.

Aging and IQ Change in Institutionalized Mentally Retarded

Full Scale IQ does not decrease with age in institutionalized mentally retarded individuals, but Performance IQ shows larger and more consistent increments.

Premorbid (early life) IQ and later mortality risk: systematic review.

Higher IQ in the first two decades of life is associated with lower rates of total mortality in middle to late adulthood.

Cognitive and language skills in adults with autism: a 40-year follow-up.

Childhood IQ is a reliable predictor of cognitive functioning in adults with autism, but a significant minority remains untestable due to severe behavioral disturbances and language impairments.

Childhood IQ's as Predictors of Adult Educational and Occupational Status.

Childhood IQ's can predict adult education and occupational status, but not enough for practical purposes.

WAIS-III IQs, Horn's theory, and generational changes from young adulthood to old age

The age-IQ relationship has changed from generation to generation, with maintained abilities being more stable than vulnerable abilities in the 1980s and 1990s.

IQ and Ability Across the Adult Life Span

Childhood IQ's as Predictors of Adult Educational and Occupational Status

Childhood IQ's can predict adult education and occupational status, but not long-term predictions for individual normal children.

The Prediction, from Infancy, of Adult IQ and Achievement.

Infant information processing ability, measured by selective attention to novelty, can predict adult IQ and academic achievement.

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