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RISS 인기검색어
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- 저자 : 유민아(Min Ah Yoo) (검색결과 4 건)
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작업기억용량 및 인지부하가 단어 재인에 미치는 영향에 대한 청년과 노년 집단 간 수행비교: 시선추적 연구
유민아(Min Ah Yoo),오승하(Seung Ha Oh),경정숙(Jeong Sug Kyong),성지은(Jee Eun Sung) 한국언어청각임상학회 2021 Communication Sciences and Disorders Vol.26 No.2
배경 및 목적: 본 연구는 청년과 노년을 대상으로 작업기억용량과 인지부하 정도의 차이가 단어 재인 능력에 미치는 영향에 대해 시선추적기법을 통해 알아보고자 하였다. 방법: 청년과 노년 집단별로 24명씩, 총 48명이 본 실험에 참여하였으며, 세부적으로 각 집단 내에서 작업기억용량(고, 저) 집단으로 분류하였다. 본 연구는 인지부하 조건(고, 저)인 숫자 외우기 과제와 단어 재인 과제를 실시하였다. 본 연구의 결과에 대해 오프라인 측정변수인 반응정확도, 반응시간, 온라인 측정변수인 시선고정비율로 나누어 분석하였다. 결과: 반응정확도 및 반응시간의 경우, 단어 재인 과제에서 청년 및 노년 집단 간 주효과가 유의하였다. 추가로 반응시간의 경우, 작업기억용량에 따른 인지부하 조건 간 이차상호작용이 유의하였다. 시선고정비율의 경우, 집단 간 주효과가 유의하였다. 또한, 시간 구간에 따른 집단 간, 인지부하 조건 간 이차상호작용이 유의하였으며, 시간 구간별 인지부하 조건 및 집단 간 삼차상호작용도 유의하였다. 논의 및 결론: 반응정확도와 달리 반응시간, 시선고정비율은 집단 간 차이 이외에 인지부하, 작업기억용량 요인과의 상호작용효과가 유의하였다. 이를 통해 언어처리는 인지부하, 작업기억용량 같은 복합적인 요인이 영향을 미쳤음을 간접적으로 시사한다. 더 나아가 언어 처리과정에 대해 반응정확도 측정만으로는 충분하지 않다. 따라서 오프라인 측정변수와 함께 온라인 측정변수를 통해 노화, 작업기억용량, 인지부하 조건과 단어 재인 능력에 대한 연관성을 확인할 수 있음을 보여준다. Objectives: The purpose of the study was to identify the impact of age-related working memory capacity and cognitive load to word recognition using an eye tracker. Methods: A total of 48 participants (24 young, 24 elderly adults) who were divided according to working memory capacity (high, low) participated in the study. This study consisted of a digit load and word recognition task. Results: First, the elderly group had lower accuracy and slower response times than the young group. There was a significant difference between working memory capacity and cognitive load in response time. In the group with low working memory capacity, the response time increased under lower cognitive load, which was different from the group with a high working memory capacity. Next, the elderly group had a lower proportion of fixation than the young group by time interval. In addition, there was a significant interaction between group and cognitive load by time interval. In particular, the proportion of fixation decreased over time under a high cognitive load while the proportion of fixation increased under a low cognitive load in the elders, because the inhibition and switching abilities were weakened which made the elders unable to process information efficiently. Conclusion: The study results showed significant effects between working memory capacity and cognitive load in response time and proportion of fixation. This implies that complex factors influence language processing, which makes measuring accuracy insufficient. Thus, this research confirms the correlation among aging, working memory, and cognitive load through both online and offline measurement.
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Dietary Effect of Puer Tea Extract on the Body Weight in Rats
Jong Won Kim,Sun Ah Baek,Hyo Jeong Kim,Qing Ye,Su Won Kim,Jin Sik Nam,Kyung Hee Kang,Myung Hee Kang,Seong Tak Doh,Sun Il Kwon,Seung Ju Ahn,Su Jung Kim,Min Yoo(유민) 대한의생명과학회 2010 Biomedical Science Letters Vol.16 No.1
Puer tea is a traditional beverage originating from Yunnam area of China. It supplies basic nutrients such as vitamin C. It has been well reported that daily drinking of Puer tea can help the digestion and ease the stomachache after food intake. Puer tea also contains various polyphenols which may exert antibacterial activity against Staphylococcus aureus and Listeria monocytogenes. Because of these functional effects on digestive system we suspected if Puer tea can display any dietary effect or decrease the obesity after long-term drinking. We employed 6-week old SD rats as experimental animal and treated them with extract of Puer tea in relation to the body weights. Rats were divided into 5 groups (NC, PC, E, E+P, E+P5). NC group was experimental control and rest of them are as follows: water only (PC), water with exercise (E), water with exercise and Puer tea extract (E+P), water with exercise and 5X extract of Puer tea (E+P5). Feeding was carried out every day for 5 weeks by oral administration. Reduction rate of body weights was highest in E group. Relative ratio of losing weight was as follows: PC group (100.78%), E group (95.57%), E+P group (94.53%) and E+P5 group (74.22%), respectively. Exercise was more helpful to control the body weight. The result strongly suggests that Puer tea is highly effective to control the body weight and could be used for pharmaceutical purpose to treat obesity without side effects.
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Antioxidative Effects and Anticancer Activities of Puer Tea Extract
Hyo-Jeong Kim,Su-Won Kim,Sun-Ah Baek,Min Yoo(유민) 대한의생명과학회 2010 Biomedical Science Letters Vol.16 No.4
Puer tea is a traditional beverage originating from Yunnan area of China. We have analyzed 11 different commercial tea brands provided by Daboo Culture and Art Center. This study was carried out to evaluate the contents of polyphenols, antibacterial activity, antioxidantive ability and physiological activities of extracts from Puer tea. The electron donating ability was ranged from 57.26~99.16% and SOD-like activity was ranged from 1.4~10.4%. The inhibitory effect on the growth of cancer cell lines was examined by MTT assay. The Puer tea extract exhibited the greatest inhibitory effect at the concentration of 2% for all cancer cells tested.
KCI
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