Durability of the partial reinforcement and partial delay of reinforcement extinction effects after minimal acquisition training

Four groups of 10 rats each were given six acquisition trials (Phase 1) under continuous reinforcement (CR), partial reinforcement (PR), constant delay (CD), or partial delay of reinforcement (PD) conditions. In Phase 2, all Ss were given 18 nonreinforced trials, followed by 12 continuously reinforced trials in Phase 3. In Phase 4, all Ss were given 12 more extinction trials. A constant 24-h ITI was observed throughout the experiment. A strong partial reinforcement extinction effect (PREE) was obtained in both Phases 2 and 4. Only a temporary partial delay of reinforcement effect (PDRE) was observed, which was restricted to the first nine trials of the first extinction phase. No constant delay of reinforcement effect (CDRE) was observed in either extinction phase. The results were discussed in terms of both frustration and sequential theories.     

A follow-up study of the effect of pedagogical training on teaching in higher education

The present follow-up study examines the effect of university teachers’ pedagogical training on approaches to teaching and self-efficacy beliefs measured by Approaches to Teaching Inventory and an additional part measuring motivational strategies. The effect of pedagogical training on teaching is analysed among 35 teachers who had not participated in pedagogical courses after the first measurement in 2004 as well as among 45 teachers who had acquired more pedagogical training after the first measurement. The results showed that there were more positive changes in the measured scales among teachers who had acquired more credits of pedagogical courses since the year 2004 than among teachers who had not acquired more credits. The results of the first and second measurements are compared.     

Electrical Characterization of Semiconductor Diode Using Alternating Signal Measurements at Forward Bias

TheelectricalcharacterizationofSchottkyandp njunctiondiodesasthesimplestdeviceshasbeenanimportantsubjectforoverhalfacentury .WebelievethattheDCcur rent voltage (I V)measurementsarethemosthelpfulmethodstocharacterizetheparametersofdiodesuntilnow .Manytechniques ,foranalysisofI Vplotatforwardbias,areusedtoextractthediodeparameters[1— 17] .However,anI Vplotitselfcanprovidemerelyafinitequantityofinformation ,henceeachtechniquehasitsownlimitationsandisvalidonlyfortoosimpleassumptionsonthediode…     

Hole transport and phonon scattering in epitaxial PbSe films

The combined characterizations of mobility and phonon scattering spectra allow us to probe hole transport process in epitaxial PbSe crystalline films grown by molecular beam epitaxy （MBE）. The measurements of Hall effect show p-type conductivity of PbSe epitaxial films. At 295 K, the PbSe samples display hole concentrations of （5-8）× 10^17 cm^-3 with mobilities of about 300 cm^2/（V·s）, and at 77 K the hole mobility is as high as 3×10^3 cm^2/（V·s）. Five scattering mechanisms limiting hole mobilities are theoretically analyzed. The calculations and Raman scattering measurements show that, in the temperatures between 200 and 295 K, the scattering of polar optical phonon modes dominates the impact on the observed hole mobility in the epitaxial PbSe films. Raman spectra characterization observed strong optical phonon scatterings at high temperature in the PbSe epitaxial films, which is consistent with the result of the measured hole mobility.     

Observed peer victimization during early elementary school: continuity, growth, and relation to risk for child antisocial and depressive behavior

The rate at which 266 boys and girls ages 5 to 7 years old were victimized by peers was observed on multiple occasions in kindergarten and first grade. Individual differences in victimization were observed at kindergarten entry and in growth over the subsequent 2 years. Victimization increased for some children but decreased for others. Growth in victimization was reciprocally related to growth in teacher-reported antisocial and depressive behavior for boys. For girls, kindergarten victimization was related to growth in parent-reported antisocial behavior, teacher-reported depressive behavior to growth in victimization, and growth in victimization to parent-reported depression. At a short-term group level, antisocial behavior had a lagged suppressive effect on victimization for boys but a facilitating effect for girls.     

Switching Phenomena of CuTCNQ Induced Mainly by the Interaction among Microcrystaline Grains

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Individual differences in sign language abilities in deaf children

The study attempted to identify characteristics of individual differences in sign language abilities among deaf children. Connections between sign language skills and rapid serial naming, hand motor skills, and early fluency were investigated. The sample consisted of 85 Finnish deaf children. Their first language was sign language. Simple correlations and multiple linear-regression analysis demonstrated the effect of early language development and serial hand movements on sign language abilities. Other significant factors were serial fingertapping and serial naming. Heterogeneity in poor sign language users was noted. Although identifying learning disorders in deaf children is complicated, developmental difficulties can be discovered by appropriate measurements. The study confirmed the results of earlier research demonstrating that the features of deaf and hearing children's learning resemble each other. Disorders in signed and spoken languages may have similar bases despite their different modalities.     

Doing the right thing: infants' selection of actions to imitate from observed event sequences

Two studies were conducted to investigate how 14- to 16-month-old infants select actions to imitate from the stream of events. In each study, an experimenter demonstrated two actions leading to an interesting effect. Aspects of the first action were manipulated and whether infants performed this action when given the objects was observed. In both studies, infants were more likely to imitate the first action when it was physically necessary to generate the effect, and in Study 2 they were also more likely to imitate the action when it was socially cued. It seems that infants' own knowledge of space and causality as well as their sensitivity to others' social signals both contribute to their tendency to imitate actions.     

N-十六烷基-羟乙基-二甲基溴化铵与牛血清白蛋白的结合作用

用荧光光谱法研究了298K时Tris-HC l缓冲溶液（pH=7.1）中季铵盐类表面活性剂N-十六烷基-羟乙基-二甲溴化铵（CHDAB）与牛血清白蛋白（BSA）的结合作用.考察了BSA浓度对结合作用的影响,用Stern-Volmer方程探讨了CHDAB在浓度较低区域与BSA的作用机制,用位点结合模型计算了CHDAB与BSA结合反应的结合常数KA和结合位点数n,用同步荧光技术考察了CHDAB对BSA构象的影响.结果表明：CHDAB对BSA的内源荧光有猝灭作用,并导致其最大发射波长蓝移;相同温度下,BSA浓度越小,其Stern-Volmer猝灭常数Ksv越大,CHDAB对BSA的猝灭作用越强,同时其结合常数也越大,结合越强;同步荧光光谱表明CHDAB对BSA构象产生了一定影响.     

The relationship between classroom quality and students’ engagement in secondary school

Student engagement has been identified as an influential mediator between classroom interactional quality and adolescent learning outcomes. This study examined the relationship between classroom quality and student behavioural engagement in secondary school classrooms. Three dimensions of classroom quality (emotional, organisational and instructional support) and the dimension of student engagement were observed in nine classrooms using the Classroom Assessment Scoring System. Self-ratings of behavioural engagement were provided by 181 Finnish secondary school students along with their teachers’ ratings of classroom-level student engagement. The results showed, first, that there was variation in both classroom quality and student behavioural engagement between the classrooms. Second, classroom organisational support was associated with observed and with teacher- and student-rated engagement, and instructional support was associated with student-rated and observed engagement. Third, emotional support did not have a direct effect on student engagement but contributed to student engagement indirectly via organisational and instructional support. There were no gender differences with respect to self-reported engagement. Class size had a positive effect on teacher-rated engagement. The results demonstrated specific associations between the domains of classroom quality and student behavioural engagement in secondary school classrooms.     

A Comparison of the English Vocabulary Used by Children of Non-American Ancestry in Hawaii before they Reach the Age of Seven Years with that of Kindergarten Children in Continental United States

The authors investigated 2 issues concerning the power of latent growth modeling (LGM) in detecting linear growth: the effect of the number of repeated measurements on LGM's power in detecting linear growth and the comparison between LGM and some other approaches in terms of power for detecting linear growth. A Monte Carlo simulation design was used, with 3 crossed factors (growth magnitude, number of repeated measurements, and sample size) and 1,000 replications within each cell condition. The major findings were as follows: For 3 repeated measurements, a substantial proportion of samples failed to converge in structural equation modeling; the number of repeated measurements did not show any effect on the statistical power of LGM in detecting linear growth; and the LGM approach outperformed both the dependent t test and repeated-measures analysis of variance (ANOVA) in terms of statistical power for detecting growth under the conditions of small growth magnitude and small to moderate sample size conditions. The multivariate repeated-measures ANOVA approach consistently underperformed the other tests.     

Histological knowledge as a predictor of medical students' performance in diagnostic pathology

Over the years, the role and extent of the basic sciences in medical curricula have been challenged by research on clinical expertise, clinical teachers, and medical students, as well as by the development and diversification of the medical curricula themselves. The aim of this study was to examine how prior knowledge of basic histology and histopathology among students predicts early learning of diagnostic pathology. Participants (N=118, representing 91% of the full student cohort) were medical students at the University of Turku, Finland. Data were collected during two preclinical courses that students attended in their first and second years of medical school. The measurements included tests on biomedical and clinical knowledge and a performance test in diagnostic pathology. Second‐year performance on the diagnostic pathology examinations was predicted by the students' prior knowledge of histology, but not by the students' prior knowledge of histopathology. Although earlier research has demonstrated similar results in studies with shorter longitudinal designs, the present study demonstrates that the effect remains even if there is a considerably long time delay (a year) between the measurements, thus confirming the long‐term value of basic science studies in the preclinical phase. Anat Sci Educ 6: 361–367. © 2013 American Association of Anatomists.     

大类招生对信息与计算科学专业人才培养的影响与对策

本文介绍了我校信息与计算科学专业改革目标,探讨了大类招生对专业人才培养的积极意义及影响,并提出了相应的对策。     

The Effects of Using Different Procedures to Score Maze Measures

The purpose of this study was to examine how different scoring procedures affect interpretation of maze curriculum‐based measurements. Fall and spring data were collected from 199 students receiving supplemental reading instruction. Maze probes were scored first by counting all correct maze choices, followed by four scoring variations designed to reduce the effect of random guessing. Pearson's r correlation coefficients were calculated among scoring procedures and between maze scores and a standardized measure of reading. In addition, t tests were conducted to compare fall to spring growth for each scoring procedure. Results indicated that scores derived from the different procedures are highly correlated, demonstrate criterion‐related validity, and show fall‐to‐spring growth. Educators working with struggling readers may use any of the five scoring procedures to obtain technically sound scores.     

Motor-Cognitive Stimulation of the Elderly

This article shows the cognitive and motor-perceptive effects of the application of a cognitive stimulating program through motor function on 234 elderly people. The assessment was carried out prior to and after the program. Significant improvements in the experimental group were observed (p ≤ .05) in six of the eight measurements. The control group achieved significant improvements (p ≤ .05) in two of the measurements and significant deterioration in motor memory.     

The big-fish-little-pond effect on academic self-concept and interest in first- and third-grade students

BackgroundThe big-fish-little-pond effect (BFLPE) postulates that class-average achievement has a negative effect on students’ academic self-concept. Research examining the BFLPE with elementary school students is scarce, especially with first graders.AimsThis study examined the BFLPE of class-average achievement on academic self-concept and interest in the math domain with first and third graders.SampleParticipants were Luxembourgish first graders (N = 5057) and third graders (N = 4925).MethodsA multilevel, doubly latent approach was used to assess a BFLPE model containing achievement (as the predictor) and ASC and interest (as outcomes) in the math domain.ResultsThe BFLPE on math self-concept was supported in both grades, whereas the BFLPE on math interest was supported only for third graders. In both grades, larger effect sizes were observed for the BFLPE on math self-concept than on math interest.ConclusionOur results suggest that the social comparisons underlying the BFLPE play an important role in the formation of math self-concept in both grades, but they play a less substantial—and probably later—role in the formation of math interest in elementary school.     

Effects of locus of a brief stimulus in a second-order schedule with pigeons

On the completion by pigeons of four equal fixed intervals on one key, a light on a second key signaled that one peck on that key would be followed by food. In condition A, a brief stimulus of a further color was produced on the first key by the pecks that ended the first three (but not the fourth) fixed intervals. In condition B, no brief stimuli occurred at the end of the first three fixed intervals (tandem schedule). In condition C, the unpaired brief stimulus was presented on the second key after the pecks on the first key that ended the first three fixed intervals. An ABACA reversal design was used. Postreinforcement pauses were longer in condition B (tandem) than in condition A, an effect similar to that reported in similar conventional one-key second-order schedules. Postreinforcement pauses in condition C, with the brief stimulus on the second key, were also longer than in condition A, with the brief stimulus on the first key, although similar pauses were observed after the brief stimuli in both conditions. The locus of the brief stimulus appears to affect the control it exerts over behavior in a second-order schedule.     

Observed Score Linear Equating with Covariates

This paper examined observed score linear equating in two different data collection designs, the equivalent groups design and the nonequivalent groups design, when information from covariates (i.e., background variables correlated with the test scores) was included. The main purpose of the study was to examine the effect (i.e., bias, variance, and mean squared error) on the estimators of including this additional information. A model for observed score linear equating with covariates first was suggested. As a second step, the model was used in a simulation study to show that the use of covariates such as gender and education can increase the accuracy of an equating by reducing the mean squared error of the estimators. Finally, data from two administrations of the Swedish Scholastic Assessment Test were used to illustrate the use of the model.