To investigate how lead affects personality development, researchers used survey data on 1.5m adults living across America and Europe, the largest study of its kind
THAT LEAD is poisonous is not a new discovery. Documentary evidence of health problems associated with lead mining goes back to 2,000BC. In 400BC, Hippocrates, sometimes called the father of Western medicine, accurately described the symptoms of lead poisoning. In the Roman Empire, lead poisoning was common because of the metal’s use in pipes, pottery and food. Exposure to lead in childhood can also have detrimental effects on personality and behaviour, and these last into adulthood.
Agreeableness, conscientiousness, extraversion, neuroticism and openness—the “big five” personality traits—were selected as measures of healthy and mature personality profiles. These traits are well understood in psychological research. For example, low levels of agreeableness and conscientiousness are associated with drug abuse and criminal behaviours.
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