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131.
Jian Yang Ning Zhong Peipeng Liang Jue Wang Yiyu Yao Shengfu Lu 《Cognitive Systems Research》2010,11(1):16-24
Brain activation detection is an important problem in fMRI data analysis. In this paper, we propose a data-driven activation detection method called neighborhood one-class SVM (NOC-SVM). Based on the probability distribution assumption of the one-class SVM algorithm and the neighborhood consistency hypothesis, NOC-SVM identifies a voxel as either an activated or non-activated voxel by a weighted distance between its near neighbors and a hyperplane in a high-dimensional kernel space. The proposed NOC-SVM are evaluated by using both synthetic and real datasets. On two synthetic datasets with different SNRs, NOC-SVM performs better than K-means and fuzzy K-means clustering and is comparable to POM. On a real fMRI dataset, NOC-SVM can discover activated regions similar to K-means and fuzzy K-means. These results show that the proposed algorithm is an effective activation detection method for fMRI data analysis. Furthermore, it is stabler than K-means and fuzzy K-means clustering. 相似文献
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7~11岁儿童图形辨认的发展研究 总被引:3,自引:0,他引:3
本研究选取 7岁、9岁、1 1岁的 81名儿童作为被试 ,采用图形辨认任务 ,探查图形熟悉度、感觉道对小学儿童图形认知的影响 ,结果表明 :感觉通道主效应不显著。年龄主效应显著 ,1 1岁组得分显著高于 9岁组和 7岁组 ,9岁组成绩好于 7岁组 ,差异达到边沿显著。熟悉度主效应显著 ,熟悉材料的辨认成绩显著好于不熟悉成绩。年龄×图形熟悉度交互作用显著 ,年龄×感觉道交互作用不显著 ,感觉道×熟悉度主效应不显著 ,年龄×图形熟悉度×感觉道交互作用显著 ,在触觉辨认条件下 ,年龄×图形熟悉度交互作用显著 ,在视觉辨认条件下 ,年龄×图形熟悉度交互作用不显著 相似文献
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According to past research, young adults prefer positive feedback from their friends, but emotional reactions to negative feedback are less severe in Korea than in the United States. We extended this past work in several ways: We studied both giving and receiving feedback, recruited Chinese young adults, used realistic scenarios, and employed the situation‐sampling method. Using text‐message‐based vignettes, Study 1 found that both American and Chinese friends used happy emojis when exchanging positive feedback whereas Americans used less positive emojis than did the Chinese when exchanging negative feedback. We then collected actual examples of feedback that people had given to their friends (Study 2a) and showed them to new samples of Chinese and American young adults (Study 2b). This situation‐sampling methodology found that (a) Americans rated negative feedback from both cultures especially negatively, and (b) negative feedback examples from China were rated especially negatively by people in both cultures. That is, although Chinese negative feedback is seemingly more harsh, Chinese young adults do not react as negatively. 相似文献
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Purple sweet potato color (PSPC), a class of naturally occurring anthocyanins used to color food (E163), has been reported to possess a variety of biological activities, including anti-oxidant, anti-tumor, and anti-inflammatory. The effect of PSPC on the spatial learning and memory of mice treated with d-galactose (d-gal) was evaluated by the Morris water maze; d-gal-treated mice had decreased performance compared with mice in the vehicle and PSPC groups, while the PSPC + d-gal group showed significantly shortened escape latency to platform, increased swimming speed, more target quadrant search time and more platform crossings as compared with the d-gal group. Brain functions, such as memory formation and recovery of function after injury, depend on proper regulation of the expression levels of the pre- and post-synaptic proteins. We investigated the expression of four pre-synaptic proteins (growth-associated protein-43, synapsin-I, synaptophysin, and synaptotagmin) and two post-synaptic proteins (post-synaptic density protein-95 and Ca2+/calmodulin-dependent protein kinase II) in the hippocampus and cerebral cortex, respectively, in response to different treatments. Western blotting analysis showed that there were significant decreases in the expression of these representative synaptic proteins in the hippocampus and cerebral cortex of d-gal-treated mice. Interestingly, these decreased expression levels of synaptic proteins could be reversed by PSPC. The levels of expression of these representative synaptic proteins in mice treated with PSPC alone were not significantly different from those in untreated mice. The results of this study suggested that memory impairment and synaptic protein loss in d-gal-treated mice may be improved by treatment with PSPC. 相似文献
137.
自我控制是欺骗识别中一种重要的动机线索。但无论是在识别欺骗中, 自我控制扮演的动机线索角色, 还是在欺骗行为中, 自我控制扮演的监管机制的角色, 其认知机制和神经基础还不完全清楚。自我控制能力与自我控制资源对欺骗的影响也是不一样的, 而这些影响的神经基础也还没有完全破解。因此, 有必要结合行为、事件相关电位(ERP)及功能性磁共振(fMRI)等多种技术手段来考察识别欺骗和欺骗行为中自我控制能力和自我控制资源在欺骗中的作用及其心理机制。旨在探求在识别欺骗中是识别他人自我控制能力, 还是识别他人自我控制资源在起主要作用; 欺骗行为中是自我控制能力, 还是自我控制资源在起主要作用; 自我控制资源对欺骗行为的影响是符合能量耗竭观, 还是符合能量保存观。 相似文献
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140.
Yu Ling E. Scott Huebner Yu-shu He Ming-tian Zhong 《Applied research in quality of life》2016,11(4):1309-1320
Using latent class analyses (LCA), the present study aimed to test whether meaningful subtypes of internalizing and externalizing behaviors could be found among Chinese community-based adolescents. A total of 5244 adolescents, ages 11–18 years (M?=?15.11, SD?=?1.79) recruited from 16 Chinese middle schools completed the Chinese version of the Strengths and Difficulties Questionnaire (SDQ-C). We examined the data using Latent Class Analysis to identify subtypes of internalizing and externalizing behaviors among the adolescents. Multivariate Logistic regression was subsequently implemented to ascertain the relationships between latent classes and demographic covariates. Three distinct subtypes were uncovered: a high-risk group, a middle-risk group and a low-risk group; the three subtypes accounted for 19.8, 31.1, and 49.1 % of the total sample variance respectively. Youth with elevations in one behavior type were likely to have elevations in the other behavior type. Further analyses revealed that compared to the low-risk group, the adolescents from the high-risk group and middle-risk groups were female and older. Significant heterogeneity in internalizing and externalizing behaviors was revealed in this Chinese adolescent’s sample. Profiling behavior problems patterns is potentially useful as a first step in developing tailored prevention and intervention programs. Suggestions for future research, including cross-national studies, and implications for mental health professionals were discussed. 相似文献