Tinjauan Amalan Pembelajaran Koperatif Dalam Kalangan Pelajar Tingkatan Dua Maktab Rendah Sains MARA

2012 ◽  
Author(s):  
Azizi Yahaya ◽  
Noordin Yahaya ◽  
Shahrin Hashim ◽  
Jamaludin Ramli ◽  
Intan Sapinas Bahuri
Keyword(s):  
Standard Deviation ◽  
Cooperative Learning ◽  
Learning Styles ◽  
Learning Style ◽  
Peer Group ◽  
Education Institution ◽  
Mean Value ◽  
Individual Factor ◽  
The Mean ◽  
Practice Teacher

Kajian ini dijalankan untuk meninjau tentang faktor yang mempengaruhi amalan pembelajaran koperatif dalam kalangan pelajar Tingkatan Dua di sebuah Maktab Rendah Sains Mara. Responden kajian terdiri daripada 132 orang pelajar Tingkatan Dua di sebuah Maktab Rendah Sains Mara. Nilai kebolehpercayaan Alpha Cronbach untuk item dalam instrumen ini bagi keseluruhan soal selidik ini ialah 0.926. Min keseluruhan bagi faktor diri sendiri adalah 3.88 dengan sisihan piawai 0.52. Pada keseluruhannya, kajian didapati bahawa faktor rakan sebaya merupakan faktor yang paling dominan terhadap amalan pembelajaran koperatif dalam kalangan pelajar Tingkatan Dua di sebuah Maktab Rendah Sains Mara. Cadangan juga telah dikemukakan antaranya adalah responden kajian tidak dihadkan kepada pelajar peringkat sekolah sahaja tetapi boleh melibatkan pelajar dari institusi pengajian tinggi yang lain. Kajian juga diperluaskan kepada banyak sekolah dan menggunakan responden dari kawasan bandar dan luar Bandar. Kata kunci: Diri sendiri; rakan sebaya; amalan pembelajaran koperatif; guru dan suasana sekolah This study was carried out to investigate the influencing factors which affected the cooperative learning styles among form two students in a MRSM. 132 form two students were selected to be the respondents of the study. The reliability and suitability of the questionnaires Cronbach Alpha was used to determine the internal consistency of the questionnaires was at 0.926. The findings indicated that the cumulative mean value for individual factor is 3.88 with 0.52 for the standard deviation. As for peers, the mean value is 4.18 and the standard deviation value is 0.47 followed by teachers factor with 4.17 for the mean value and 0.47 for the standard deviation value. The final factor is the environment with the mean 4.17 and 0.48 for the standard deviation. The findings demonstrate that the peers play the most important role in affecting the cooperative learning style among form two students in MRSM. From the findings, some suggestions are proposed for further research. Amongst the suggestions are to involve other group of respondents for example students in universities or other higher education institution and also students in urban and rural schools. Key words: Self, peer group; cooperatif learning practice; teacher and school enviroment

STUDI EKSPERIMEN MODEL PEMBELAJARAN KOOPERATIF TIPE TAI (TEAM ASSISTED INDIVIDUALIZATION) PADA MATERI EKOSISTEM

2020 ◽  
Vol 2 (1) ◽  
pp. 63-68
Author(s):  
Ika Rosenta Purba
Keyword(s):  
Standard Deviation ◽  
Cooperative Learning ◽  
Learning Outcomes ◽  
Student Learning Outcomes ◽  
Learning Model ◽  
Mean Value ◽  
Average Value ◽  
Deviation Analysis ◽  
Post Test ◽  
The Mean

This study aims to determine student learning outcomes using the cooperative learning model type TAI (Team Assisted Individualization) on ecosystem material in SMA Negeri 6 Pematangsiantar. This research was conducted on February-March 2019 in class X (1st) SMA Negeri 6 Pematangsiantar. The population in this study was class X SMA Negeri 6 Pematangsiantar with 9 classes. The sampling method is Cluster Random Sampling, and get class X-1 as an experimental class and class X-5 as a control. The results of the analysis of the mean value of the pre-test of the control class = 38.38, the experimental class = 52.66 and the average value of the post-test of the control class = 59.75, the experimental class = 79.66. The results of the standard deviation analysis of the control class pretest = 13,886, the experimental class = 9,468 and the posttest standard deviation of the control class = 14,458, the experimental class = 6,454. The results of the hypothesis analysis (t test) were obtained t-count = 6.985 and t-table =1.99. Based on the results of research and analysis it can be concluded that the cooperative learning model of the TAI (Team Assisted Individualization) type is better for improving learning outcomes compared to conventional learning on ecosystem material in class X SMA Negeri 6 Pematangsiantar

scholarly journals High and low achievers’ dominant learning style preferences in learning English

2021 ◽  
Vol 12 (2) ◽  
pp. 179-195
Author(s):  
Raudhaturrahmi Raudhaturrahmi ◽  
Usman Kasim ◽  
Siti Sarah Fitriani
Keyword(s):  
Standard Deviation ◽  
Learning Styles ◽  
Learning Style ◽  
Mean Value ◽  
Low Achievers ◽  
High Achievers ◽  
Specific Information ◽  
Learning Style Preferences ◽  
Style Preferences ◽  
Learning English

This study aims at finding the high and low achievers’ learning style preferences and the teachers’ understanding about the students’ learning style preferences in learning English at MAN 1 Banda Aceh. The survey of this study used a combination of quantitative and qualitative methods. A questionnaire was used to explore the students’ learning style preferences, while an interview was used to get specific information about the teachers’ opinions on students’ learning style preferences in learning English. Willing (1988) category of learning style that consists of communicative, concrete, authority-oriented and analytical learning styles were used. The result of the questionnaire showed that the high achievers’ dominant learning style was the communicative one with a mean value of 3.12 and a standard deviation of 0.65. At the same time, the low achievers also favoured communicative learning style with a mean value of 3.11 and a standard deviation of 0.63. While the interview shows that the teachers were aware and understood well about students’ learning style preferences in learning English. In conclusion, by understanding their characteristics in absorbing information, the students can develop the skills in various ways to make it easier, faster and more successful for them in their learning.

PENGARUH PENDIDIKAN KESEHATAN REPRODUKSI PADA PEER GROUP (TEMAN SEBAYA) TERHADAP PENGETAHUAN DAN PERSEPSI REMAJA TENTANG PENDEWASAAN USIA PERKAWINAN DI SMA NEGERI 1 KECAMATAN NAMORAMBE KAB. DELI SERDANG 2018

2020 ◽  
Vol 1 (2) ◽  
pp. 56-66
Author(s):  
Irma Linda
Keyword(s):  
Standard Deviation ◽  
Health Education ◽  
Reproductive Health ◽  
Peer Group ◽  
Peer Groups ◽  
A Value ◽  
Significant Difference ◽  
Reproductive Health Education ◽  
The Mean ◽  
Adolescent Perceptions

Background: Early marriages are at high risk of marital failure, poor family quality, young pregnancies at risk of maternal death, and the risk of being mentally ill to foster marriage and be responsible parents. Objective: To determine the effect of reproductive health education on peer groups (peers) on the knowledge and perceptions of adolescents about marriage age maturity. Method: This research uses the Quasi experimental method with One group pre and post test design, conducted from May to September 2018. The statistical analysis used in this study is a paired T test with a confidence level of 95% (α = 0, 05). Results: There is an average difference in the mean value of adolescent knowledge between the first and second measurements is 0.50 with a standard deviation of 1.922. The mean difference in mean scores of adolescent perceptions between the first and second measurements was 4.42 with a standard deviation of 9.611. Conclusion: There is a significant difference between adolescent knowledge on the pretest and posttest measurements with a value of P = 0.002, and there is a significant difference between adolescent perceptions on the pretest and posttest measurements with a value of p = 0.001. Increasing the number of facilities and facilities related to reproductive health education by peer groups (peers) in adolescents is carried out on an ongoing basis at school, in collaboration with local health workers as prevention of risky pregnancy.

THE EFFECT BETWEEN COOPERATIVE LERANING AND LEARNING STYLE OF THE GERMANY WRITTING OUTCOM

Jurnal KATA ◽  
2017 ◽  
Vol 1 (2) ◽  
pp. 172
Author(s):  
Fauzan Adhima
Keyword(s):  
Data Analysis ◽  
Cooperative Learning ◽  
Learning Styles ◽  
Factorial Design ◽  
Learning Style ◽  
Interaction Effect ◽  
Empirical Data ◽  
Visual Learning ◽  
Design Data ◽  
Auditory Learning

<p><em>The aim of the study is to reveal the empirical data about the effect of cooperative learning and learning styles on the outcome of germany writting of SMA Negeri 42 Jakarta. The methodology used is the experimental method with a 2x2 factorial design. Data analysis performed by using two way variance analysis. The findings of the study demonstrated: 1)   The teaching cooperative leraning type STAD was higher than students who take cooperative leraning type Pair Cheks teaching. 2) The visual learning style was higher than students who have auditory learning style. 3) The students who take the teaching  cooperative leraning type Pair Cheks and have a visual learning style higher than students who take cooperative leraning type STAD and have a visual learning style . 4) The cooperative leraning type STAD and auditory learning style is higher than  cooperative leraning type Pair Cheks and have auditory learning styles. 5) The teaching cooperative leraning type STAD and have a auditory learning style was higher than the teaching cooperative leraning type STAD and have visual learning styles. 6) The cooperative leraning type Pair Cheks and have a visual learning style is higher than cooperative leraning type Pair Cheks and have auditory learning styles. 7) There is an interaction effect between  cooperative leraning  and learning style of the germany writting outcome.</em></p><p><em><br /></em></p><p> </p><p>Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pembelajaran kooperatif (tipe STAD dan tipe <em>Pair Cheks</em>) dan gaya belajar (visual dan auditori) terhadap keterampilan menulis bahasa Jerman Siswa SMA N 42 Jakarta. Penelitian ini merupakan penelitian kuantitatif dengan metode eksperimen menggunakan desain faktorial 2 X 2. Pengukuran keterampilan menulis bahasa Jerman menggunakan tes tulis sedangkan gaya belajar menggunakan kuesioner. Teknik analisis data dalam penelitian ini adalah teknkik analisis variansi (ANAVA) 2 jalur dan dilanjutkan dengan uji Tuckey untuk melihat interaksi antar kelompok.  Hasil penelitian menunjukan bahwa: (1) keterampilan menulis tipe STAD lebih baik dari pada tipe <em>Pair Cheks</em>, (2) gaya belajar visual lebih baik dari auditori, (3) gaya belajar auditori lebih baik menggunakan pembelajaran kooperatif tipe STAD dari pada tipe <em>Pair Cheks</em>, (4) keterampilan menulis bahasa Jerman kelompok siswa yang memiliki gaya belajar visual lebih baik menggunakan pembelajaran kooperatif tipe <em>Pair Cheks</em> dari pada tipe STAD, (5) Belajar dengan pembelajaran kooperatif tipe STAD lebih baik diterapkan pada siswa yang memiliki gaya belajar auditori dari pada gaya belajar visual, (6) belajar dengan pembelajaran kooperatif tipe <em>Pair Cheks</em> lebih baik diterapkan pada siswa yang memiliki gaya belajar visual dari pada auditori, dan (7) terdapat pengaruh interaksi antara pembelajaran kooperatif dan gaya belajar terhadap keterampilan menulis bahasa Jerman.</p><p>Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pembelajaran kooperatif (tipe STAD dan tipe <em>Pair Cheks</em>) dan gaya belajar (visual dan auditori) terhadap keterampilan menulis bahasa Jerman Siswa SMA N 42 Jakarta. Penelitian ini merupakan penelitian kuantitatif dengan metode eksperimen menggunakan desain faktorial 2 X 2. Pengukuran keterampilan menulis bahasa Jerman menggunakan tes tulis sedangkan gaya belajar menggunakan kuesioner. Teknik analisis data dalam penelitian ini adalah teknkik analisis variansi (ANAVA) 2 jalur dan dilanjutkan dengan uji Tuckey untuk melihat interaksi antar kelompok.  Hasil penelitian menunjukan bahwa: (1) keterampilan menulis tipe STAD lebih baik dari pada tipe <em>Pair Cheks</em>, (2) gaya belajar visual lebih baik dari auditori, (3) gaya belajar auditori lebih baik menggunakan pembelajaran kooperatif tipe STAD dari pada tipe <em>Pair Cheks</em>, (4) keterampilan menulis bahasa Jerman kelompok siswa yang memiliki gaya belajar visual lebih baik menggunakan pembelajaran kooperatif tipe <em>Pair Cheks</em> dari pada tipe STAD, (5) Belajar dengan pembelajaran kooperatif tipe STAD lebih baik diterapkan pada siswa yang memiliki gaya belajar auditori dari pada gaya belajar visual, (6) belajar dengan pembelajaran kooperatif tipe <em>Pair Cheks</em> lebih baik diterapkan pada siswa yang memiliki gaya belajar visual dari pada auditori, dan (7) terdapat pengaruh interaksi antara pembelajaran kooperatif dan gaya belajar terhadap keterampilan menulis bahasa Jerman.</p>

scholarly journals Blood Oxygenation Level Dependent Magnetic Resonance Imaging (MRI), Dynamic Contrast Enhanced MRI and Diffusion Weighted MRI for Benign and Malignant Breast Cancer Discrimination: A Preliminary Experience

Cancers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 2421
Author(s):  
Roberta Fusco ◽  
Vincenza Granata ◽  
Mauro Mattace Raso ◽  
Paolo Vallone ◽  
Alessandro Pasquale De Rosa ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Univariate Analysis ◽  
Mean Value ◽  
Blood Oxygenation ◽  
Breast Lesions ◽  
Dce Mri ◽  
Malignant Lesions ◽  
The Mean ◽  
And Diffusion ◽  
Skewness And Kurtosis

Purpose. To combine blood oxygenation level dependent magnetic resonance imaging (BOLD-MRI), dynamic contrast enhanced MRI (DCE-MRI), and diffusion weighted MRI (DW-MRI) in differentiation of benign and malignant breast lesions. Methods. Thirty-seven breast lesions (11 benign and 21 malignant lesions) pathologically proven were included in this retrospective preliminary study. Pharmaco-kinetic parameters including Ktrans, kep, ve, and vp were extracted by DCE-MRI; BOLD parameters were estimated by basal signal S0 and the relaxation rate R2*; and diffusion and perfusion parameters were derived by DW-MRI (pseudo-diffusion coefficient (Dp), perfusion fraction (fp), and tissue diffusivity (Dt)). The correlation coefficient, Wilcoxon-Mann-Whitney U-test, and receiver operating characteristic (ROC) analysis were calculated and area under the ROC curve (AUC) was obtained. Moreover, pattern recognition approaches (linear discrimination analysis and decision tree) with balancing technique and leave one out cross validation approach were considered. Results. R2* and D had a significant negative correlation (−0.57). The mean value, standard deviation, Skewness and Kurtosis values of R2* did not show a statistical significance between benign and malignant lesions (p > 0.05) confirmed by the ‘poor’ diagnostic value of ROC analysis. For DW-MRI derived parameters, the univariate analysis, standard deviation of D, Skewness and Kurtosis values of D* had a significant result to discriminate benign and malignant lesions and the best result at the univariate analysis in the discrimination of benign and malignant lesions was obtained by the Skewness of D* with an AUC of 82.9% (p-value = 0.02). Significant results for the mean value of Ktrans, mean value, standard deviation value and Skewness of kep, mean value, Skewness and Kurtosis of ve were obtained and the best AUC among DCE-MRI extracted parameters was reached by the mean value of kep and was equal to 80.0%. The best diagnostic performance in the discrimination of benign and malignant lesions was obtained at the multivariate analysis considering the DCE-MRI parameters alone with an AUC = 0.91 when the balancing technique was considered. Conclusions. Our results suggest that the combined use of DCE-MRI, DW-MRI and/or BOLD-MRI does not provide a dramatic improvement compared to the use of DCE-MRI features alone, in the classification of breast lesions. However, an interesting result was the negative correlation between R2* and D.

Rigorous time-domain analysis of statistically oriented graphene sheet fluctuations

2017 ◽  
Vol 36 (5) ◽  
pp. 1351-1363 ◽  
Author(s):  
Athanasios N. Papadimopoulos ◽  
Stamatios A. Amanatiadis ◽  
Nikolaos V. Kantartzis ◽  
Theodoros T. Zygiridis ◽  
Theodoros D. Tsiboukis
Keyword(s):  
Monte Carlo ◽  
Standard Deviation ◽  
Finite Difference ◽  
Surface Waves ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Mean Value ◽  
Content Type ◽  
The Mean ◽  
Difference Time

Purpose Important statistical variations are likely to appear in the propagation of surface plasmon polariton waves atop the surface of graphene sheets, degrading the expected performance of real-life THz applications. This paper aims to introduce an efficient numerical algorithm that is able to accurately and rapidly predict the influence of material-based uncertainties for diverse graphene configurations. Design/methodology/approach Initially, the surface conductivity of graphene is described at the far infrared spectrum and the uncertainties of its main parameters, namely, the chemical potential and the relaxation time, on the propagation properties of the surface waves are investigated, unveiling a considerable impact. Furthermore, the demanding two-dimensional material is numerically modeled as a surface boundary through a frequency-dependent finite-difference time-domain scheme, while a robust stochastic realization is accordingly developed. Findings The mean value and standard deviation of the propagating surface waves are extracted through a single-pass simulation in contrast to the laborious Monte Carlo technique, proving the accomplished high efficiency. Moreover, numerical results, including graphene’s surface current density and electric field distribution, indicate the notable precision, stability and convergence of the new graphene-based stochastic time-domain method in terms of the mean value and the order of magnitude of the standard deviation. Originality/value The combined uncertainties of the main parameters in graphene layers are modeled through a high-performance stochastic numerical algorithm, based on the finite-difference time-domain method. The significant accuracy of the numerical results, compared to the cumbersome Monte Carlo analysis, renders the featured technique a flexible computational tool that is able to enhance the design of graphene THz devices due to the uncertainty prediction.

Synchronous Issue of IR-Based Large Scale Volume Localization System

2014 ◽  
Vol 496-500 ◽  
pp. 1643-1647
Author(s):  
Ying Feng Wu ◽  
Gang Yan Li
Keyword(s):  
Standard Deviation ◽  
Mobile Robot ◽  
Large Volume ◽  
Large Scale ◽  
Image Acquisition ◽  
Mean Value ◽  
Network Synchronization ◽  
Localization System ◽  
Localization Performance ◽  
The Mean

IR-based large scale volume localization system (LSVLS) can localize the mobile robot working in large volume, which is constituted referring to the MSCMS-II. Hundreds cameras in LSVLS must be connected to the control station (PC) through network. Synchronization of cameras which are mounted on different control stations is significant, because the image acquisition of the target must be synchronous to ensure that the target is localized precisely. Software synchronization method is adopted to ensure the synchronization of camera. The mean value of standard deviation of eight cameras mounted on two workstations is 12.53ms, the localization performance of LSVLS is enhanced.

Precise computation of the direct and indirect topographic effects of Helmert's 2nd method of condensation using SRTM30 digital elevation model

2011 ◽  
Vol 1 (4) ◽  
pp. 305-312 ◽  
Author(s):  
Y. Wang
Keyword(s):  
Standard Deviation ◽  
Digital Elevation Model ◽  
Outer Zone ◽  
Mean Value ◽  
Constant Density ◽  
Topographic Effects ◽  
Topographic Effect ◽  
Digital Elevation ◽  
The Mean ◽  
Elevation Model

Precise computation of the direct and indirect topographic effects of Helmert's 2nd method of condensation using SRTM30 digital elevation modelThe direct topographic effect (DTE) and indirect topographic effect (ITE) of Helmert's 2nd method of condensation are computed using the digital elevation model (DEM) SRTM30 in 30 arc-seconds globally. The computations assume a constant density of the topographic masses. Closed formulas are used in the inner zone of half degree, and Nagy's formulas are used in the innermost column to treat the singularity of integrals. To speed up the computations, 1-dimensional fast Fourier transform (1D FFT) is applied in outer zone computations. The computation accuracy is limited to 0.1 mGal and 0.1cm for the direct and indirect effect, respectively.The mean value and standard deviation of the DTE are -0.8 and ±7.6 mGal over land areas. The extreme value -274.3 mGal is located at latitude -13.579° and longitude 289.496°, at the height of 1426 meter in the Andes Mountains. The ITE is negative everywhere and has its minimum of -235.9 cm at the peak of Himalayas (8685 meter). The standard deviation and mean value over land areas are ±15.6 cm and -6.4 cm, respectively. Because the Stokes kernel does not contain the zero and first degree spherical harmonics, the mean value of the ITE can't be compensated through the remove-restore procedure under the Stokes-Helmert scheme, and careful treatment of the mean value in the ITE is required.

scholarly journals PENGARUH MODEL PEMBELAJARAN KOOPERATIF TSTS–NHT DAN GAYA BELAJAR TERHADAP HASIL BELAJAR PENGANTAR BISNIS

2019 ◽  
Vol 12 (1) ◽  
pp. 88
Author(s):  
Mendarissan Aritonang ◽  
Abdul Hamid K ◽  
Julaga Situmorang
Keyword(s):  
Cooperative Learning ◽  
Learning Styles ◽  
Learning Outcomes ◽  
Learning Style ◽  
Random Sampling ◽  
Business Students ◽  
Learning Model ◽  
Learning Models ◽  
Quasi Experimental ◽  
Cluster Random Sampling

Abstrak: Penelitian ini bertujuan :(1) Untuk mengetahui hasil belajar pengantar bisnis mahasiswa yang diajar dengan model pembelajaran kooperatif tipe TST lebih tinggi dari mahasiswa yang diajar dengan model pembelajaran kooperatif tipe NHT. (2) Untuk mengetahui hasil belajar  pengantar bisnis mahasiswa yang memiliki gaya belajar teoritis dan mahasiswa yang memiliki gaya belajar pragmatis. (3) Untuk mengetahui interaksi antara model pembelajaran kooperatif dengan gaya belajar  terhadap hasil belajar pengantar bisnis. Penelitian ini dilaksanakan di Universitas Methodist Indonesia. Populasi berjumlah 180 orang. Pengambilan sampel dilakukan dengan cluster random sampling. Metode penelitian kuasi eksperimen dengan desain faktorial 2 x 2 dilanjutkan dengan statistik inferensial dengan menggunakan ANAVA dua jalur dengan taraf signifikan α = 0,05 yang dilanjutkan dengan uji Scheffe. Hasil penelitian menunjukkan: (1) hasil belajar pengantar bisnis mahasiswa yang diajarkan dengan model pembelajaran kooperatif tipe TSTS lebih tinggi dari pada hasil belajar pengantar bisnis mahasiswa yang diajarkan dengan model pembelajaran kooperatif tipe NHT; (2) hasil belajar pengantar bisnis mahasiswa yang memiliki gaya belajar teoritis lebih tinggi dari pada hasil belajar pengantar bisnis mahasiswa yang memiliki gaya belajar pragmatis; (3) terdapat interaksi antara model pembelajaran kooperatif dengan gaya belajar  dalam mempengaruhi hasil belajar mahasiswa.  Kata Kunci: model pembelajaran kooperatif, TST, NHT, gaya belajar, pengantar bisnis.  Abstract: This study aims: (1) To find out the introductory learning outcomes of business students who are taught with the cooperative learning model of the TST type are higher than students who are taught with the cooperative learning model of the NHT type. (2) To find out the introductory learning outcomes of business students who have theoretical learning styles and students who have pragmatic learning styles. (3) To determine the interaction between cooperative learning models with learning styles on introductory business learning outcomes. This research was conducted at the Methodist University of Indonesia. The population is 180 people. Sampling was done by cluster random sampling. Quasi-experimental research method with 2 x 2 factorial design followed by inferential statistics using two-way ANAVA with a significant level α = 0.05 followed by the Scheffe test. The results showed: (1) the results of introductory business learning students who were taught with the cooperative learning model type TSTS were higher than the results of introductory business learning students who were taught with the NHT type cooperative learning model; (2) the results of introductory business learning students who have theoretical learning styles are higher than the results of introductory business learning students who have pragmatic learning styles; (3) there is an interaction between cooperative learning models and learning styles in influencing student learning outcomes. Keywords: cooperative learning model, TST, NHT, learning style, business introduction.

scholarly journals Time-to-Boundary Function to Study the Development of Upright Stance Control in Children

2017 ◽  
Vol 11 (1) ◽  
pp. 49-58
Author(s):  
Carmen D'Anna ◽  
Maurizio Schmid ◽  
Andrea Scorza ◽  
Salvatore A. Sciuto ◽  
Luisa Lopez ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Postural Control ◽  
Postural Stability ◽  
Age Groups ◽  
Boundary Function ◽  
Mean Value ◽  
Upright Stance ◽  
Eyes Closed ◽  
The Mean ◽  
Spatio Temporal

Background: The development of postural control across the primary school time horizon is a complex process, which entails biomechanics modifications, the maturation of cognitive ability and sensorimotor organization, and the emergence of anticipatory behaviour. Postural stability in upright stance has been thus object of a multiplicity of studies to better characterize postural control in this age span, with a variety of methodological approaches. The analysis of the Time-to-Boundary function (TtB), which specifies the spatiotemporal proximity of the Centre of Pressure (CoP) to the stability boundaries in the regulation of posture in upright stance, is among the techniques used to better characterize postural stability in adults, but, as of now, it has not yet been introduced in developmental studies. The aim of this study was thus to apply this technique to evaluate the development of postural control in a sample population of primary school children. Methods: In this cross-sectional study, upright stance trials under eyes open and eyes closed were administered to 107 healthy children, divided into three age groups (41 for Seven Years' Group, Y7; 38 for Nine Years' Group, Y9; 28 for Eleven Years' Group, Y11). CoP data were recorded to calculate the Time-to-Boundary function (TtB), from which four spatio-temporal parameters were extracted: the mean value and the standard deviation of TtB minima (Mmin, Stdmin), and the mean value and the standard deviation of the temporal distance between two successive minima (Mdist, Stddist). Results: With eyes closed, Mmin and Stdmin significantly decreased and Mdist and Stddist increased for the Y7 group, at Y9 Mmin significantly decreased and Stddist increased, while no effect of vision resulted for Y11. Regarding age groups, Mmin was significantly higher for Y9 than Y7, and Stdmin for Y9 was higher than both Y7 and Y11; Mdist and Stddist resulted higher for Y11 than for Y9. Conclusion: From the combined results from the spatio-temporal TtB parameters, it is suggested that, at 9 years, children look more efficient in terms of exploring their limits of stability than at 7, and at 11 the observed TtB behaviour hints at the possibility that, at that age, they have almost completed the maturation of postural control in upright stance, also in terms of integration of the spatio-temporal information.

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