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These studies suggest that IQ does not necessarily decrease with age, and in some cases, performance scores may even increase.
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The relationship between age and IQ has been a subject of extensive research. Various studies have explored how IQ changes over time, considering factors such as heritability, environmental influences, and specific conditions like whole-brain irradiation. This synthesis aims to present a cohesive understanding of how IQ is affected by aging based on multiple research findings.
Heritability and Environmental Influence on IQ with Age:
Impact of Whole-Brain Irradiation on IQ:
IQ Changes in Institutionalized Mentally Retarded Populations:
The research indicates that while the heritability of IQ increases and environmental influences decrease with age, specific conditions like whole-brain irradiation can lead to significant declines in IQ, especially in younger children. In institutionalized mentally retarded populations, IQ does not necessarily decline with age; in fact, there can be slight improvements, particularly in performance-related aspects. Overall, the impact of age on IQ is multifaceted and influenced by various factors, including genetic heritability, environmental conditions, and specific medical treatments.
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