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Scientists know that lead exposure during childhood harms the developing brain and nervous system, but it is not clear if childhood lead exposure has long-lasting effects on adult brain function. Changes in adult intelligence quotients â IQs â is a way to measure effects of lead and other neurotoxic substances.
Lead is a potent neurotoxin whose toxicity has been recognized for at least thousands of years. Though neurotoxic effects for lead are found in both adults and young children, the developing brain is particularly susceptible to lead-induced harm, effects which can include apoptosis and excitotoxicity.