Connecting concepts in the brain by mappingcortical representations of semantic relations

읽은 날	2020.07.21	학술지	Nature communications
제목	Connecting concepts in the brain by mapping cortical representations of semantic relations
저자	Yizhen Zhang 1, Kuan Han1, Robert Worth 2 & Zhongming Liu 1,3,4,5
한줄요약	우리의 뇌는 어떠한 단어에 대한 concept나 단어의 relations에 관한 정보를 저장할 때에 특정한 cortex뿐만 아니라 다양한 network를 사용한다.
초록	In the brain, the semantic system is thought to store concepts. However, little is known about how it connects different concepts and infers semantic relations. To address this question, we collected hours of functional magnetic resonance imaging data from human subjects listening to natural stories. We developed a predictive model of the voxel-wise response and further applied it to thousands of new words. Our results suggest that both semantic categories and relations are represented by spatially overlapping cortical patterns, instead of anatomically segregated regions. Semantic relations that reflect conceptual progression from concreteness to abstractness are represented by cortical patterns of activation in the default mode network and deactivation in the frontoparietal attention network. We conclude that the human brain uses distributed networks to encode not only concepts but also relationships between concepts. In particular, the default mode network plays a central role in semantic processing for abstraction of concepts.
키워드	semantic category, semantic relation, brain network,
의의	단어의 semantic concept나 relation을 생각할 때 다양한 뇌의 network가 관여한다는 것을 밝혀냄. 특히나 그 단어의 속성이 emotion처럼 abstract한 경우에는 DMN가 관여한다는 사실을 밝혀냄.
비판점	Semantic relation이 사람마다 주관적인 경우의 데이터는 구하지 못함. 개개인마다 생각하는 relation이 다르기 때문이다. 비판점이라기보다는 그냥 끄적...