Symmetries in human brain language pathways correlate with verval recall
http://www.pnas.org/content/104/43/17163.full.pdf+html
http://www.pnas.org/content/104/43/17163.full.pdf+html
key aspect of human brain organization.
① We used diffusion tensor MRI to perform in vivo virtual dissection of language pathways to
assess the relationship between brain asymmetry and cognitive performance in the normal population.
②Our findings suggest interhemispheric differences in direct connections between Broca’s
and Wernicke’s territories, with extreme leftward lateralization in
more than half of the subjects and bilateral symmetrical distribution in only 17.5% of the subjects.
③ Importantly, individuals withmore symmetric patterns of connections are better overall at
remembering words using semantic association.
④Moreover, preliminary analysis suggests females are more likely to have a
symmetrical pattern of connections.
⑤These findings suggest that the degree of lateralization of perisylvian pathways is heterogeneous
in the normal population and, paradoxically, bilateral representation,
not extreme lateralization, might ultimately be advantageous for specific cognitive functions.
① We used diffusion tensor MRI to perform in vivo virtual dissection of language pathways to
assess the relationship between brain asymmetry and cognitive performance in the normal population.
②Our findings suggest interhemispheric differences in direct connections between Broca’s
and Wernicke’s territories, with extreme leftward lateralization in
more than half of the subjects and bilateral symmetrical distribution in only 17.5% of the subjects.
③ Importantly, individuals withmore symmetric patterns of connections are better overall at
remembering words using semantic association.
④Moreover, preliminary analysis suggests females are more likely to have a
symmetrical pattern of connections.
⑤These findings suggest that the degree of lateralization of perisylvian pathways is heterogeneous
in the normal population and, paradoxically, bilateral representation,
not extreme lateralization, might ultimately be advantageous for specific cognitive functions.
また別の本には
Scientists tells that having a second language seems to enable some mysterious brain connections
which are otherwise not used at all.These active connectiona allow people to learn additional foreign languages more easily.
あと何歳までに語学を始めれば語学が習得できるという年齢制限（臨界期）ってあるのでしょうか。
http://www.weblio.jp/wkpja/content/%E8%87%A8%E7%95%8C%E6%9C%9F%E4%BB%AE%E8%AA%AC_%E8%87%A8%E7%95%8C%E6%9C%9F%E4%BB%AE%E8%AA%AC%E3%81%AE%E6%A6%82%E8%A6%81
これによると生まれてから大人になる間に脳も成長して脳の左右分化（lateralization)がおこるという。これがおこると語学習得が困難になるという。
でも最初の論文を読むと脳の左右分化（laterarization)の度合いに個人差があるらしい。で、脳の左右分化があまりおこっていない人（子供に近い人）はいくつになっても語学が習得できるようだ。でこういう文章がでてくる。
Paradoxically,not extreme laterarization might ultimately be advantageous.
which are otherwise not used at all.These active connectiona allow people to learn additional foreign languages more easily.
あと何歳までに語学を始めれば語学が習得できるという年齢制限（臨界期）ってあるのでしょうか。
http://www.weblio.jp/wkpja/content/%E8%87%A8%E7%95%8C%E6%9C%9F%E4%BB%AE%E8%AA%AC_%E8%87%A8%E7%95%8C%E6%9C%9F%E4%BB%AE%E8%AA%AC%E3%81%AE%E6%A6%82%E8%A6%81
これによると生まれてから大人になる間に脳も成長して脳の左右分化（lateralization)がおこるという。これがおこると語学習得が困難になるという。
でも最初の論文を読むと脳の左右分化（laterarization)の度合いに個人差があるらしい。で、脳の左右分化があまりおこっていない人（子供に近い人）はいくつになっても語学が習得できるようだ。でこういう文章がでてくる。
Paradoxically,not extreme laterarization might ultimately be advantageous.
でもこれは母国語での話だ。