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Children's cognitive ability from 4 to 9 years old as a function of prenatal cocaine exposure, environmental risk,

David S Bennett1, Margaret Bendersky, Michael Lewis

  • 1Department of Psychiatry, Drexel University College of Medicine, Philadelphia, PA 19144, USA. David.Bennett@Drexelmed.edu

Developmental Psychology
|July 9, 2008
PubMed

Insights

Prenatal cocaine exposure is linked to lower IQ scores in boys, persisting into preadolescence. Environmental factors and maternal intelligence also significantly impact children's cognitive development.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Pediatrics

Background:

  • Prenatal exposure to substances like cocaine can impact child development.
  • Cognitive deficits in children exposed to cocaine prenatally require further investigation.
  • Understanding the influence of environmental factors and maternal intelligence is crucial for child cognitive outcomes.

Purpose of the Study:

  • To investigate the long-term effects of prenatal cocaine exposure on children's cognitive ability.
  • To examine the moderating roles of gender and age in prenatal cocaine exposure effects.
  • To assess the impact of environmental risk and maternal verbal intelligence on cognitive development.

Main Methods:

  • A cohort of 231 children (91 cocaine-exposed, 140 unexposed) were assessed at ages 4, 6, and 9 years.
  • The Stanford-Binet IV intelligence test was used to measure cognitive ability.
  • Mixed models analysis was employed to examine exposure effects, moderators, and covariates.

Main Results:

  • Prenatal cocaine exposure interacted with gender, resulting in lower composite IQ scores for boys.
  • Cognitive deficits in cocaine-exposed boys were observed across multiple domains, including Abstract/Visual Reasoning.
  • A stimulating home environment and higher maternal verbal IQ were associated with higher child IQ scores.

Conclusions:

  • Prenatal cocaine exposure poses a continued risk for mild cognitive deficits in children through preadolescence.
  • The observed gender interaction suggests differential vulnerability to prenatal cocaine effects.
  • Environmental enrichment and maternal cognitive status are protective factors for cognitive development.

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