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  3. Overprotective parents inhibit more than their kids’ freedom: they may also slow brain growth in an area linked to mental illnes

Overprotective parents inhibit more than their kids’ freedom: they may also slow brain growth in an area linked to mental illnes

admin2010-12-04  74
问题       Overprotective parents inhibit more than their kids’ freedom: they may also slow brain growth in an area linked to mental illness. Children whose parents are overprotective or neglectful are believed to be more susceptible to psychiatric disorders—which in turn are associated with defects in part of the prefrontal cortex.
      To investigate the link, Kosuke Narita of Gunma University, Japan, scanned the brains of 50 people in their 20s and asked them to fill out a survey about their relationship with their parents during their first 16 years. The researchers used a survey called the Parental Bonding Instrument, an internationally recognized way of measuring children’s relationships with their parents. It asks participants to rate their parents on statements like "Did not want me to grow up", "tried to control everything I did" and "tried to make me feel dependent on her/him". Narita’s team found that those with overprotective parents had less grey matter in a particular area of the prefrontal cortex than those who had had healthy relationships. Neglect from fathers, though not mothers, also correlated with less grey matter. This part of the prefrontal cortex develops during childhood, and abnormalities there are common in people with schizophrenia and other mental illnesses. Narita and his team propose that the excessive release of the stress hormone cortisol (皮质醇)—due either to neglect, or to too much attention and reduced production of dopamine as a result of poor parenting leads to stunted grey matter growth.
   Anthony Harris, director of the Clinical Disorders Unit at Westmead Hospital in Sydney, Australia, says the study is important for highlighting to the wider community that parenting styles can have long-term effects on children. But he adds that such brain differences are not always permanent. "Many individuals show great resilience (恢复力，弹性)," he says. Stephen Wood, who studies adolescent development at the Melbourne Neuropsychiatry Centre in Australia, says the brain abnormalities cannot necessarily be blamed on children’s relationship with their parents. He points out that the subjects studied may have been born with the abnormalities and as a result didn’t bond well with their parents, rather than vice versa. Wood also takes issue with the study team’s decision to exclude individuals with low socioeconomic status and uneducated parents two factors known to contribute to poor performance in cognitive tests. "The effect they found may be real, but why worry about parenting if there are other factors that are so much larger?" he says.
Besides excessive release of the stress hormone cortisol, what is the other reason for stunted grey matter?
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答案The reduced production of dopamine．
解析 细节归纳题。本题考查灰质发育受到抑制的原因。文中指出，灰质发育受阻是由于应激素皮质醇的过度释放以及多巴胺产量下降，故答案为The reduced production of dopamine。
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