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  • Sometimes incorrectly done procedures during birth
  • Inadequate or insufficient stimulation during infancy and childhood
  • Physical trauma
  • Excessive radiation
  • Excessive heat
  • Excessive pressure
  • Oxygen starvation
  • Stroke
  • Long-term Alcoholism and/or continuing to drink with a physiological dependence on alcohol
  • Several drugs if misused enough
  • Mother's substance abuse during pregnancy
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14y ago

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