메뉴 건너뛰기
.. 내서재 .. 알림
소속 기관/학교 인증
인증하면 논문, 학술자료 등을  무료로 열람할 수 있어요.
한국대학교, 누리자동차, 시립도서관 등 나의 기관을 확인해보세요
(국내 대학 90% 이상 구독 중)
로그인 회원가입 고객센터 ENG
주제분류
인문학
인문학 일반 역사학 철학 종교학 어문학 기타 인문학
사회과학
사회과학 일반 경영학 관광학 교육학 군사학 문헌정보학 법학 사회학 신문방송학 심리과학 정치외교학 지리학 행정학 경제학 무역학 인류학 기타 사회과학
자연과학
자연과학 일반 물리학 생물학 생활과학 수학·통계학 천문학 지구과학 화학 기타 자연과학
공학
공학 일반 건축공학 기계공학 산업공학 재료·에너지공학 전기전자공학 조선해양공학 화학공학 컴퓨터학 기타공학
의약학
의학 일반 간호학 수의학 약학 한의학 기초의학 임상의학 기타 의약학
농수해양학
농수해양학 일반 농학 수산학 식품과학 임학 축산학 해상운송학 기타 농수해양학
예술체육학
예술 일반 디자인 미술 미용 사진 음악학 의상 체육 공연매체예술 기타 예술체육학
복합학
학제간연구 과학기술학 뇌인지과학 기술정책 기타 복합학

ENG

추천
검색

논문 기본 정보

자료유형
학술저널
저자정보
저널정보
서울대학교 인지과학연구소 Journal of Cognitive Science Journal of Cognitive Science 제16권 제1호
발행연도
2015.1
수록면
59 - 70 (12page)

이용수

표지
📌
연구주제
📖
연구배경
🔬
연구방법
🏆
연구결과
AI에게 요청하기
추천
검색

초록· 키워드

오류제보하기
Uncertainty of incoming information increases the amount of mental effort. Scientists might have been interested in quantifying the amount of this mentaleffort, as evidenced by the great amount of research devoted to computing theenergy used to deal with the uncertainty of an event. One of these measuresis Shannon’s entropy, which was initially used as a measure of the level ofuncertainty with respect to the outcome of an event (Shannon, 1948). Asdefined by Shannon, entropy is expected to increase as the level of disorder(uncertainty or task complexity) increases. Therefore, to evaluate how the braindeals with entropy, one could either locate the focal area showing activity thatis positively correlated with the degree of uncertainty or consider informationtransfer. We speculated that a functionally effective brain would modulate its network to fit to the varying entropy, since computation in the brain isprobabilistic. Therefore, we put forward two hypotheses: 1) the functionalbrain architecture will reflect the varying entropy, and 2) the entropy willbe modality-specific. In order to test these hypotheses, we estimated severalnetwork properties of the magnetoencephalography time-series signalsobtained from healthy monolingual listeners. We particularly focused onwhether entropy reflcts the modality-specifi processing load, especially whenthe degrees of the processing load of the two events were similar in terms ofthe rate of accuracy and the length of response time between tasks. In order tomanipulate both entropy and modality, we varied the processing complexity(easy vs. diffiult) in either a linguistic or non-linguistic (pitch change detectionvs. word intelligibility test) task. Using graph-theoretical measures, the globalorganisation measures of the network, such as its small-worldness, correlationcoeffiient, global effiiency, and characteristic path-lengths, were comparedwithin the network extracted as a set of 78 brain atlas nodes. The resultsshowed a significant main effect of task complexity on the brain networkproperties, demonstrating that task load is indeed ubiquitous regardless oftask modality. Equally importantly, we also found a pronounced task-specifidifference in the network properties between linguistic and non-linguisticmodalities. Regardless of modality, in the effortful tasks, the characteristicpath-length and the correlation-coefficient were significantly larger, whereasthe linguistic tasks resulted in signifiantly higher small-worldness, with thehubs located at the usual language nodes. Our findings collectively suggestthat task load is ubiquitous but is also modality-specifi in the brain networkproperties, as evidenced by the specifi network graph measures.
#Entropy #brain network #task complexity #language

목차

등록된 정보가 없습니다.

참고문헌 (25)

참고문헌 신청
Yu S / 2014 / Topological changes of the effective connectivity during the working memory training. Conference proceedings, Annual International Conference of the IEEE Engineering in Medicine and Biology Society / IEEE Engineering in Medicine and Biology Society Annual Conference 2014 :6242~6245 google schola Zhou Z / 2011 / A conditional Granger causality model approach for group analysis in functional magnetic resonance imaging / Magnetic resonance imaging 29:418~433 google schola Zipf GK / 1949 / Human behavior and the principle of least effort; an introduction to human ecology / Addison-Wesley Press :573 google schola Baggio HC / 2014 / Functional brain networks and cognitive deficits in Parkinson's disease / Human brain mapping 35 : 4620 ~ 4634 google schola Bolanos ME / 2011 / Multivariate synchrony modules identified through multiple subject community detection in functional brain networks / Conference proceedings, Annual Internation google schola

함께 읽어보면 좋을 논문

논문 유사도에 따라 DBpia 가 추천하는 논문입니다. 함께 보면 좋을 연관 논문을 확인해보세요!

이 논문의 저자 정보

최근 본 자료

전체보기

댓글(0)

0