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Intelligence and Lead Toxins in Rural Children

R.W. Thatcher, PhD, is professor and director of the Applied Neumscience Institute at the Uniwrsity of Maryland Eastern Shore and the University of Maryland School of Medicine. He received his PhD in Neuropsycho~ogyfr om the Uniwrsity of Waterloo. Address: R.W. Thatcher, PhD, Applied Neuroscience Institute, University of Maryland Eastern Shore, Princess Anne, MD 21853.

M. L. Lester, MS

M.L. Leaer receiwd his master's degree in Psychology from the University of Connecticut and is n w at the Applied Neuroscience Institute.

R. McAlaster, MS

R. McAlaster, MS has a master's degree in Psychology from the State Uniwrsity of New York, Stony Brook, and is the clinic coordinator for the head trauma naluation unit at the University of Maryland School of Medicine.

R. Horst, PhD

R. Horst is now at the Applied Neuroscience Institute and got his PhD in Psychology from Carnegie-Mellon Uniwrsity.

S. W. Ignasias, MS

S. W. Ignasias, MS received her master's degree in Education from the University of Indiana.

Hair lead content, intelligence tests, school achievement, and motor impairment assessments were obtained from 149 public school children aged 5 to 16. Hair lead concentration significantly discriminated between groups and significantly predicted IQ scores, independent of group classifications. Regression analyses showed a significant negative correlation between lead and intellectual functioning, even in the normal to gifted IQ range. These results demonstrate a continuous inverse relationship between intelligence and relatively low levels of body lead in which the higher levels of cognitive function are affected before any signs of gross motor impairment are seen.

Journal of Learning Disabilities, Vol. 16, No. 6, 355-359 (1983)
DOI: 10.1177/002221948301600611


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