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1.
Students who are highly anxious about mathematics-related activities generally exhibit lower mathematics achievement and motivation compared to their less anxious counterparts. Despite negative implications of mathematics anxiety (MA) on mathematics learning, there is a paucity of research examining how MA develops over time. Using the Longitudinal Study of American Youth dataset (N = 3116), the present study investigated two main questions regarding the development of MA in secondary school: (1) Is the development of MA characterized by a heterogeneous subset of growth trajectories? (2) How are time-varying personal and environmental factors (e.g., mathematics achievement; perceptions of math teachers) related to specific MA growth trajectories? Student MA was repeatedly assessed in six annual waves spanning across middle and high school. Using growth mixture modeling, we identified four growth trajectories of MA: (1) The non-anxious group that exhibited chronically low MA; (2) The highly anxious group which displayed moderately high MA over time; (3) The resilient group that exhibited high initial MA that steadily decreased over time; and (4) The vulnerable group that reported low initial MA that drastically increased over time. In addition, significant differences in the development of mathematics achievement, personality hardiness, and perceptions of mathematics teachers were found in these four MA groups. Findings highlight heterogeneity in the development of MA, identify middle school as a critical period for MA development, and emphasize the importance of examining developmental changes in cognitive, personality, and environmental factors to help clarify distinct MA trajectories across middle and high school.  相似文献   

2.
The eigenface method that uses principal component analysis （PCA） has been the standard and popular method used in face recognition. This paper presents a PCA - memetic algorithm （PCA-MA） approach for feature selection. PCA has been extended by MAs where the former was used for feature extraction/dimensionality reduction and the latter exploited for feature selection. Simulations were performed over ORL and YaleB face databases using Euclidean norm as the classifier. It was found that as far as the recognition rate is concerned, PCA-MA completely outperforms the eigenface method. We compared the performance of PCA extended with genetic algorithm （PCA-GA） with our proposed PCA-MA method. The results also clearly established the supremacy of the PCA-MA method over the PCA-GA method. We further extended linear discriminant analysis （LDA） and kernel principal component analysis （KPCA） approaches with the MA and observed significant improvement in recognition rate with fewer features. This paper also compares the performance of PCA-MA, LDA-MA and KPCA-MA approaches.  相似文献   

3.
A negative correlation between mathematics performance and mathematics anxiety (MA) has been identified in students of varying ages. However, little is known as to whether this correlation diminishes when environmental factors are incorporated as moderator variables.Specifically, the effect of home numeracy activities (HNA) and parental MA on students’ performance-MA relationship has received little attention. Furthermore, there have been no studies that consider HNA frequency as reported by the children themselves. A sample of 311 Chilean second graders and their parents participated in the present study. We examined whether HNA frequency moderates the performance-MA relationship and whether this moderation is in turn moderated by parent MA. Results showed that the frequency of HNA strengthened or diminished the negative correlation between performance and MA as a function of parent MA. In the case of parents with low MA, regardless of HNA frequency, child mathematics performance was negatively associated with child MA. However, in the case of math-anxious parents that interacted frequently with their children, there was no association between child MA and math achievement. More broadly, the present study suggests that mathematics-related family dynamics and parents’ emotions are key to understanding the relationship between performance and MA in early development.  相似文献   

4.
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5.
To investigate the features of electroencephalography (EEG) power and coherence at rest and during a working memory task of patients with mild cognitive impairment (MCI). Thirty-five patients (17 males, 18 females; 52～71 years old) and 34 sex- and age-matched controls (17 males, 17 females; 51～63 years old) were recruited in the present study. Mini-Mental State Examination (MMSE) of 35 patients with MCI and 34 normal controls revealed that the scores of MCI patients did not differ significantly from those of normal controls (P＞0.05). Then, EEGs at rest and during working memory task with three levels of working memory load were recorded. The EEG power was computed over 10 channels: right and left frontal (F3, F4), central (C3,C4), parietal (P3, P4), temporal (TS, T6) and occipital (O1, O2); inter-hemispheric coherences were computed from five electrode pairs of F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 for delta (1.0～3.5 Hz), theta (4.0～7.5 Hz), alpha-1 (8.0～10.0 Hz), alpha-2 (10.5～13.0 Hz), beta-1 (13.5～18.0 Hz) and beta-2 (18.5～30.0 Hz) frequency bands. All values of the EEG power of MCI patients were found to be higher than those of normal controls at rest and during working memory tasks. Furthermore, the values of EEG power in the theta, alpha-1, alpha-2 and beta-1 bands of patients with MCI were significantly high (P＜0.05) in comparison with those of normal controls. Correlation analysis indicated a significant negative correlation between the EEG powers and MMSE scores. In addition, during working memory tasks, the EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group (P＜0.05). However, there was no significant difference in EEG coherences between two groups at rest. These findings comprise evidence that MCI patients have higher EEG power at rest, and higher EEG power and coherence during working conditions. It suggests that MCI may be associated with compensatory processes at rest and during working memory tasks. Moreover, failure of normal cortical connections may be exist in MCI patients.  相似文献   

6.
We examined associations between the explicit mathematics-related gender stereotypes of students, parents, teachers, and classmates and students’ motivational-affective outcomes in mathematics (self-concept, interest, anxiety) at the end of Grade 9. Based on representative data from the German Trends in Student Achievement 2018 study (N = 30,019), results of latent multilevel mixture models show that boys’ and girls’ explicit beliefs in the stereotype favoring their own gender in-group (i.e., boys’/girls’ belief that boys/girls do better at mathematics) were related to higher levels of self-concept and interest and to lower anxiety. Parents’ gender stereotypes showed an incremental association with all three outcomes for girls but only with mathematics self-concept for boys. Gender stereotypes of teachers were not related to students’ outcomes. However, classmates’ stereotypes favoring girls or boys in mathematics were negatively associated with outcomes of the positively stereotyped group. Thus, a male student in a classroom with classmates who share the traditional stereotype that boys do better at mathematics than girls would hold a lower self-concept and interest and higher anxiety level after controlling for the beneficial individual association of himself having the same belief and his motivational and affective outcomes. Similarly, a girl’s motivational-affective outcomes would be more favorable in the same environment characterized by the shared traditional stereotype of mathematics as a male domain after controlling for the negative individual association. Shared stereotypes in the classroom could thus trigger social comparison processes to which students are more susceptible than to stereotypes of their teachers.  相似文献   

7.
数学焦虑是由数学问题和情境引发的一系列自我强迫和紧张,接近精神病学中的焦虑症状.在深入了解我国中小学数学教育现状的基础上分析其成因,着重讨论教师观念上的错误和教学行为的不当,提出帮助学生克服数学焦虑的若干建议.  相似文献   

8.
分析高中生数学焦虑的现状,探究数学焦虑对高中生数学成绩的影响,为缓解高中生数学焦虑的心理辅导提供实证依据.采用自编的《高中生数学焦虑问卷》评估了207名高中生的数学焦虑水平,运用相关分析和回归分析探究高中生数学焦虑与学业成绩的关系.结果显示：高中生数学焦虑的平均得分为2.65;高中生的数学焦虑总体得分与其数学成绩呈显著性负相关（r=-0.322,P＜0.01）;高中生数学焦虑中的课堂学习过程焦虑和应考情景焦虑对其数学成绩具有显著的预测作用.  相似文献   

9.
Attribute reduction is necessary in decision making system. Selecting right attribute reduction method is more important. This paper studies the reduction effects of principal components analysis （PCA） and system reconstruction analysis , SRA） on coronary heart disease data. The data set contains 1723 records, and 71 attributes in each record. PCA and SRA are used to reduce attributes number （less than 71 ） in the data set. And then decision tree algorithms. C4.5, classification and regression tree （ CART）, and chi-square automatic interaction detector （ CHAID ）, are adopted to analyze the raw data and attribute reduced data. The parameters of decision tree algorithms, including internal node number, maximum tree depth, leaves number, and correction rate are analyzed. The result indicates that. PCA and SRA data can complete attribute reduction work. and the decision-making rate on the reduced data is quicker than that on the raw data： the reduction effect of PCA is better than that of SRA. while the attribute assertion of SRA is better than that of PCA. PCA and SRA methods exhibit good performance in selecting and reducing attributes.  相似文献   

10.
INTRODUCTION Nowadays, as a large number of residential blocks and college campuses are being constructed nationwide in China, improvement in the quality of residential community becomes a rising issue of city policy and urban planning. Layouts of open spaces in residential areas are predicated on their ability to deliver both a mechanism to maintain the viability of citizens’ outdoor lives and a treatment to alleviate the high-density of urban constructions. What kinds of residential o…  相似文献   

11.
Cultivated barley is known to have a complex population structure and extensive linkage disequilibrium (LD). To conduct robust association mapping (AM) studies of economically important traits in US barley breeding germplasm, population structure and LD decay were examined in a complete panel of US barley breeding germplasm (3 840 lines) genotyped with 3 072 single nucleotide polymorphisms (SNPs). Nine subpopulations (sp1‒sp9) were identified by the program STRUCTURE and subsequently confirmed by principle component analysis (PCA). Out of the nine subpopulations, seven were very similar to the respective subpopulations identified by Hamblin et al. (2010) which were based on half of the germplasm and half of the SNP markers, but two subpopulations were found to be new. One subpopulation was dominated by six-rowed spring lines from Utah State University (UT) and the other was composed of six-rowed spring lines from multiple breeding programs (USDA-ARS Aberdeen (AB), Busch Agricultural Resources Inc. (BA), UT, and Washington State University (WA)). LD was found to decay across a range from 4.0 to 19.8 cM. This result indicates that the germplasm genotyped with 3 072 SNPs would be robust for mapping and possibly identifying the causal polymorphisms contributing to disease resistance and perhaps other traits.  相似文献   

12.
Objective： To assess functional relationship by calculating inter- and intra-hemispheric electroencephalography （EEG） coherence at rest and during a working memory task of patients with mild cognitive impairment （MCI）. Methods： The sample consisted of 69 subjects： 35 patients （n = 17 males, n = 18 females; 52-71 years old） and 34 normal controls （n = 17 males, n = 17 females; 51 -63 years old）. Mini-mental state examination （MMSE） of two groups revealed that the scores of MCI patients did not differ significantly from those of normal controls （P〉0.05）. In EEG recording, subjects were performed at rest and during working memory task. EEG signals from F3-F4, C3-C4, P3-P4, T5-T6 and O1-O2 electrode pairs are resulted from the inter-hemispheric action, and EEG signals from F3-C3, F4-C4, C3-P3, C4-P4, P3-O1, P4-O2, T5-C3, T6-C4, T5-P3 and T6-P4 electrode pairs are resulted from the intra-hemispheric action for delta （1.0-3.5 Hz）, theta （4.0-7.5 Hz）, alpha-1 （8.0-10.0 Hz）, alpha-2 （10.5-13.0 Hz）, beta-1 （13.5-18.0 Hz） and beta-2 （18.5-30.0 Hz） frequency bands. The influence of inter- and intra-hemispheric coherence on EEG activity with eyes closed was examined using fast Fourier transformation from the 16 sampled channels. Results： During working memory tasks, the inter- and intra-hemispheric EEG coherences in all bands were significantly higher in the MCI group in comparison with those in the control group （P〈0.05）. However, there was no significant difference in inter- and intra-hemispheric EEG coherences between two groups at rest. Conclusion： Experimental results comprise evidence that MCI patients have higher degree of functional connectivity between hemispheres and in hemispheres during working condition, It suggests that MCI may be associated with compensatory processes during working memory tasks between hemispheres and in hemispheres. Moreover, failure of normal cortical connections may exist in MCI patients.  相似文献   

13.
Research has shown that rates of clinical anxiety levels are higher among young people with an ASD than their typically developing peers. This study conducted an exploratory investigation into the impact of a specifically tailored CBT group programme on anxiety levels in young people with ASD. The 12 week CBT programme was delivered to 12 children with a diagnosis of ASD in a children’s disability team in Ireland. An embedded mixed methods design was utilised and inferences were drawn by collecting and analysing quantitative and qualitative data separately. Findings indicate CBT can be delivered successfully to a group of children with ASD. As is the nature of an embedded design, quantitative findings are reported as supportive evidence for the qualitative findings of this study. The positive preliminary findings suggest a rigorous, large scale evaluation is needed to determine the overall effectiveness of the programme with this population.  相似文献   

14.
通过使用外语阅读焦虑量表FLRAS,调查了广西贺州学院120名学生的英语阅读课堂焦虑状况,讨论分析了其与阅读能力和表现自我满意度的相互关系。所得的调查结果表明:焦虑在地方院校学生的英语课堂阅读中存在非常普遍;学生阅读焦虑与英语阅读表现自我满意度的关系是中度相关;阅读焦虑与英语阅读能力自我满意度的关系也呈现出了相互相关关系。本研究结果也为克拉申的情感过滤假说提供了实证数据。  相似文献   

15.
To investigate inter- and intra-hemispheric electroencephalography (EEG) coherence at rest and during photic stimulation of patients with Alzheimer‘s disease (AD). Thirty-five patients (12 males, 23 females; 52-64 y) and 33 sex- and age-matched controls (12 males, 21 females; 56-65 y) were recruited in the present study. EEG signals from C3-C4, P3-P4, TS-T6 and O1-O2 electrode pairs resulted from the inter-hemispheric action, and EEG signals from C3-P3, C4-P4, P3-O1, P4-O2, C3-O1, C4-O2, TS-O1 and T6-O2 electrode pairs resulted from the intra-hemispheric action. The influence of inter- and intra-hemispheric coherence on EEG activity with eyes closed was examined, using fast Fourier transformation from the 16 sampled channels. The frequencies of photic stimulation were fixed at 5, l0 and 15 Hz, respectively. The general decrease of AD patients in inter- and intra-hemispheric EEG coherence was more significant than that of the normal controls at the resting EEG, with most striking decrease observed in the alpha-1 (8.0-9.0 Hz) and alpha-2 (9.5-12.5 Hz) bands. During photic stimulation, inter- and intra-hemispheric EEG coherences of the AD patients having lower values in the alpha (9.5-10.5 Hz) band than those of the control group. It suggests that under stimulated and non-stimulated conditions, AD patients had impaired inter- and intra-hemispheric functional connections, indicating failure of brain activation in alpha-related frequency.  相似文献   

16.
This study examined the effectiveness of an integrated training programme (ITP) in reducing female students’ test anxiety with a view to the mothers’ perfectionism as a moderating factor. A total of 60 primary school students (30 mothers with perfectionism trait and 30 mothers without perfectionism) were randomly selected using multi-stage cluster sampling and screening methods. Spielberger’s Test Anxiety Scale and Multidimensional Perfectionism Scale (MPS) were administered to the students and mothers, respectively. The participants were placed into four groups (two experimental and two control groups). The experimental groups received intervention in 14 sessions. The results suggested significant differences between experimental and control groups, but there was no significant difference between the two experimental groups (group 1: students with test anxiety and perfectionist mothers and group 2: students with test anxiety and non-perfectionist mothers). The moderating effect of mothers’ perfectionism was not statistically confirmed. Implications of the study are discussed.  相似文献   

17.
Previous research examined the influence of math anxiety (MA) on performance in mathematics, but few studies compared the contribution of MA to other forms of anxiety, such as test and general anxiety (GA). Unlike MA, ego‐resiliency promotes the management of challenges, and has been positively associated with mathematics performance. In this study, we investigated the specific influence of MA, test‐ and GA, and ego‐resiliency on mathematics performance after controlling for intelligence. Children from grades 5 to 8 (N = 274) were assessed with self‐report tools measuring MA, test and GA, and ego‐resiliency, and completed intelligence and mathematical tasks. The results of structural equation models showed that MA had a main negative effect on mathematics performance, over and above the effect of test‐ and GA. Ego‐resiliency had a positive effect on mathematics performance, and was negatively associated with GA. Our findings are discussed in terms of the implications for intervention programs to reduce anxiety and sustain ego‐resiliency.  相似文献   

18.
The authors examined how children’s frontal electroencephalogram (EEG) theta/beta ratio—an index of neurocognitive control—changed from baseline to a social stressor, and whether these EEG changes moderated the relation between temperament and anxiety. Children (N = 152; Mage = 7.82 years, 52% male, 81% White) had their EEG recorded during a baseline and speech anticipation condition. Children’s frontal theta/beta ratio decreased from baseline to speech anticipation, and this baseline-to-task change moderated the relation between temperamental shyness and social anxiety. Temperamental shyness was related to higher state and trait social anxiety only among children with large baseline-to-task decreases in theta/beta ratio. Findings are consistent with theoretical models hypothesizing that temperamentally shy children with heightened neurocognitive control may be at greater risk for anxiety.  相似文献   

19.
This experiment investigated the effects of a comprehensive teaching assistant (TA) training program on the teaching anxiety and effectiveness of TAs. Twenty-seven TAs in the English department of a research university were divided into experimental and control groups. Both groups participated in a one-week workshop and a sixteen-week theory and pedagogy course during a fall semester. TAs in the experimental group also participated in a consultant observation program and peer mentoring activities. Data resulting from the completed pretests and posttests for teaching anxiety and effectiveness were analyzed using either at-test or an analysis of covariance. Conclusions from the study include: (1) Declines in teaching anxiety for TAs in the experimental group were significantly greater. (2) Neither group of TAs improved in teaching effectiveness, as measured by general student evaluations. However, based on posttest means for these student ratings, the teaching effectiveness of the experimental group was rated significantly higher. (3) Student ratings of teaching effectiveness in composition for TAs in the experimental group were significantly higher. (4) There were no significant differences between pre- to posttest changes in the self-appraisals of teaching effectiveness for the groups.  相似文献   

20.
Abstract

Research in outdoor and adventure activities has frequently focused on participant outcomes but has seldom sought to understand the experiences of the leader. This case study evaluates changes in the anxiety of a leader during an eight day residential experience for 30 Physical Education students, based in the Langdale Valley (English Lake District). A one way analysis of variance revealed significant differences in the self confidence scores of the leader measured using the CSAI-2 for the time prior to the group completing a ridge walk supervised by members of the teaching team, and prior to the group's self contained two day expedition (p=0.048).

The data also supports a general trend of higher cognitive and somatic anxiety before the group activities commenced in the morning and last thing at night. Qualitative information in the form of field diary entries supported that increases in anxiety and a reduction in self-confidence were symptomatic of instances where the leader felt that they could not directly influence event outcomes.

This study recognises a potential need for leaders to consider the implementation of strategies to manage stress levels during extended residential periods, although further research is required to more fully understand the phenomenon of leader anxiety.  相似文献   

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