IQ scores are stable over the lifespan from "summary" of IQ and Human Intelligence by Nicholas Mackintosh
One of the key findings in the field of intelligence research is the remarkable stability of IQ scores over the lifespan. Studies have shown that individuals tend to maintain their relative position in terms of IQ compared to their peers as they age. This means that if someone has a high IQ in childhood, they are likely to have a high IQ in adulthood as well. This stability in IQ scores has been observed in longitudinal studies that track individuals over many years. These studies have found that while there may be some fluctuations in IQ scores, the overall pattern is one of consistency. This suggests that intelligence is a relatively stable trait that remains relatively constant throughout the lifespan. The stability of IQ scores over the lifespan has important implications for our understanding of intelligence. It suggests that intelligence is not something that can easily be changed or manipulated. While individuals can certainly learn new skills and acquire knowledge, their underlying level of intelligence, as measured by IQ, is likely to remain relatively stable. This stability in IQ scores also challenges the notion that intelligence is entirely a product of environmental factors. While it is true that environmental influences can play a role in shaping intelligence, the stability of IQ scores over the lifespan suggests that there is also a significant genetic component to intelligence.- The concept that IQ scores are stable over the lifespan is a key finding in the study of intelligence. It highlights the consistency of intelligence as a trait and has important implications for our understanding of the nature of intelligence and its development over time.
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