P NAI X LO IQ Exposure to maltreatment or trauma early in life is linked to lower IQ, research finds. Being abused, physically or emotionally, neglected or witnessing domestic violence, was linked to an IQ score 7 points lower, on average.

Exposure to maltreatment or trauma early in life is linked to lower IQ, research finds.

Being abused, physically or emotionally, neglected or witnessing domestic violence, was linked to an IQ score 7 points lower, on average.