This is a recent study by the neurobiologist Paul Thompson and his colleagues in which they -- using MRI -- measured the distribution of gray matter -- that is, the outer layer of the cortex -- in a large sample of pairs of people.
これは　神経科学者ポール　トンプソンらの 最近の研究です 彼らはMRIを使って 多数の二人組被験者の脳の灰白質 ―つまり　脳の皮質―の 分布を測ったのです