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These studies suggest that IQ can change over time, with minimal changes in most children but significant changes in certain groups, such as schizophrenia patients, siblings of schizophrenia patients, children with very high IQs, and across different generations, with various factors influencing the stability and direction of change.
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Research on the topic of IQ change over time has explored various aspects of intellectual development and the stability of intelligence across different age groups and populations. This synthesis of findings from multiple studies will provide insights into the nature of IQ change.
In conclusion, the research suggests that IQ can change over time, but the patterns of change are complex and vary across different populations and age groups. While some individuals may experience significant changes in IQ, for many, the stability of IQ over time is relatively high. The factors influencing these changes include age, the presence of mental health conditions, initial IQ levels, and possibly institutionalization. Overall, the evidence points to both stability and change in intelligence across the lifespan, with the nature and extent of change being influenced by a variety of factors.
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