两者的大脑看起来也不同。
Stutterers tend, for instance, to have more densely packed grey matter in the areasassociated with processing and producing sounds.
比如,有关处理和产生声音的区域上覆盖的灰质,口吃者要更密集。
Such differences in activity and anatomy, though, must have deeper causes.
活动性和解剖上的不同一定存在着更深层的原因。
And, in time-honoured fashion, there is a debate about whether those causes are genetic orenvironmental.
而这些原因是基因上的还是环境上的,其争论的历史也相当悠久。
Dennis Drayna of America s National Institutes of Health argued to the meeting thatpersistent stuttering is at least partly a matter of genes.
美国国家卫生研究院的丹尼斯.德雷纳在会上说道,持续的口吃至少一部分原因是基因问题。
It runs in families.
在家族中遗传。
Studies of twins suggest a genetic component larger than those known to be involved inhigh cholesterol and osteoporosis.
对双胞胎的研究表明这个遗传因素要比胆固醇和骨质疏松症的遗传因素高。
At least two studies of adopted children suggest that those whose adoptive parents stutterare no more likely to develop the impediment than those taken on by non-stutterers.
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