When it comes to brain size, bigger doesn't always mean better.
当涉及到大脑体积，更大并不总是意味着更好。
Modern humans have an average brain size of about 1350 cc.
现代人类有大约1350毫升的平均脑容量。
They found that brain size decreased as population density increased.
他们发现，大脑的尺寸随着人口密度的增长而减小。
Stress can affect brain size. So can depression, research shows.
研究显示，紧张和抑郁会影响脑容量。
Overall healthy, he said, accounts for some differences in brain size.
他说，整体的健康水平说明大脑体积存在着某些差别。
We have seen reports of Boskop brain size ranging from 1, 650 to 1, 900 cc.
我们目前可以看到的报告上，博斯科普头骨的脑容积从1650到1900cc不等。
This study overturns the long-held belief that brain size has increased across all mammals.
这项研究颠覆了我们长久以来的观点，所有哺乳动物的脑的面积都在增加。
But even among the smartest bird species, there's still natural variation in brain size.
但是，即使是最聪明的鸟类，它们的大脑尺寸也存在自然变化。
But our results suggest brain size isn't everything when it comes to the capacity for social learning.
但是，我们的研究结果表明，对于社会学习能力来说，大脑的大小并不代表一切。
Although brain size is largely determined by genetics, the researchers say lifestyle can have an impact.
虽然脑袋大小主要是由遗传决定的，但是研究人员说，生活习惯也会有影响。
Then nine years later, scientists took brain scans of the participants to measure their brain size.
接着9年后，科学家对参加者进行大脑扫描以测量他们大脑的尺寸。
The researchers are now planning to investigate what caused the variation in brain size among big cats.
研究者们正在计划调查是什么导致了大型猫科动物在大脑尺寸方面的变化。
These can include smaller head or brain size, poorly formed eyes, slow growth and severe learning difficulties.
这种畸形包括头或者脑子变小，先天性弱视还有成长缓慢，严重的学习障碍。
Though the sample was small, the team found no significant difference between the two groups other than brain size.
虽然这个抽样很小，她的团队还是发现两组并没有太大差异除了大脑尺寸。
No. A study concluded there is a correlation between head size and brain size, but that IQ was not related to size.
不会。研究表示头的大小最多只与脑的大小有关，与智商并无关联。
This coincided with the emergence of echolocation, so improved communication skills likely were tied to the brain size boost.
与此同时，海豚的大脑有了回声定位的能力.因此,沟通能力的提升也很有可能与大脑体积的增大相关。
UK scientists, writing in Science, looked at how brain size varied depending on how much people thought about decisions.
《科学》杂志中写道，英国科学家根据人们对自己的决定进行思考的多少来观察大脑的大小。
The size of human muscle mass only decrease slightly, yet brain size gets much smaller. So this cannot be the major reason.
肌肉群知识略有缩小，而人脑变小了很多，所以这不可能是主要原因。
Even if agriculture were the explanation for the change in stature, it would not clarify why human brain size has also decreased.
而且即使农业真的可以用来解释人类身材的变化，它仍然无法解释为什么人的脑容量同样缩小了。
Thee size of human muscle mass only decrease slightly, yet brain size gets much smaller. So this cannot be the major reason.
肌肉群知识略有缩小，而人脑变小了很多，所以这不可能是主要原因。 羚。
Scientists say this new evidence is the first to show that brain size is a key factor for animals' survival in urban environments.
科学家说这个新的证据首次表明脑袋尺寸是影响动物在城市环境中生存的关键因子。
They examined the growth rates of the brain size relative to body size to see if there were any changes in the proportions over time.
他们检测了大脑尺寸相对于体型的发育速度，以观察在这6000万年间，其速率是否产生了任何变化。
They focused their attentions on 12 cities in Switzerland and France to find out about the relationship between brain size and survival.
他们将注意力集中在瑞士和法国12个城市中，为了找出大脑尺寸和存活率之间的关系。
And indeed, brain size does loosely correlate with intelligence, between species and, as recent MRI studies confirm, within our own.
的确，在不同物种间，脑袋大小与智力高低大致相关；磁共振造影(mri)的最新研究，更证实了人类当中也存在这样的关联性。
Most of the decline in physical size has happened in the past 10, 000 years, and has been accompanied by a 10% decline in brain size.
身材缩小的现象主要出现在过去1万年中，而且人类脑容量也同期减少了10%。
Most of the decline in physical size has happened in the past 10, 000 years, and has been accompanied by a 10% decline in brain size.
身材缩小的现象主要出现在过去1万年中，而且人类脑容量也同期减少了10%。
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