An analysis of data gathered from 14 independent studies indicates that the influence of genes on intelligence varies according to people’s social class in the US, but not in Western Europe or Australia. The findings are published in Psychological Science, a journal of the Association for Psychological Science.
Research suggests that genes and environment both play a critical role in shaping a person’s intelligence. A longstanding hypothesis in the field of behavioral genetics holds that our potential intelligence, as set by our genes, is more fully expressed in environments that are supportive and nurturing, but is suppressed in conditions of poverty and disadvantages. While some studies have provided evidence supporting this hypothesis, others have not.
To better understand the impact of social class on the link between genes and intelligence, psychological scientists Elliot Tucker-Drob of the University of Texas at Austin and Timothy Bates at the University of Edinburgh conducted a meta-analysis, combining data from all available published and unpublished studies.
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