Cognitive and academic abilities associated with symptoms of attention-deficit/hyperactivity disorder: a comparison between subtypes in a Greek non-clinical sample

The study assessed cognitive and academic performance of children demonstrating teacher-rated ADHD-related symptoms (Inattention [IA] and/or Hyperactivity/Impulsivity [H/I]) in a representative sample of, largely untreated, Greek elementary school students (N?=?923). A battery of tests assessing short-term memory (STM), sustained attention, executive functions (EFs), reading and math skills were administered. Significant deficits in EFs and STM were restricted to the groups of students displaying inattention symptoms and were only marginally elevated among students showing hyperactivity/impulsivity symptoms alone, in comparison to their non-symptomatic peers. A similar pattern of group differences was observed on tests assessing word- and text-level reading skills. Impaired performance on sustained attention tasks was less evident. Among students who manifested inattention symptoms, those who also showed impaired reading skills presented more severe EFs deficits than typically achieving students. Results demonstrated a close link between EFs, other than inhibition and set-shifting, everyday symptoms of inattention, and achievement in math and word-level reading skills.     

Students teach students: Alternative teaching in Greek secondary education

The students of a Greek junior high school collaborated to prepare the teaching material of a theoretical Computer Science (CS) course and then shared their understanding with other students. This study investigates two alternative teaching methods (collaborative learning and peer tutoring) and compares the learning results to the traditional learning context. A test was used to measure all participating students’ learning results and a questionnaire was distributed to record participant student attitudes towards the alternative teaching conditions. The questionnaire was designed to evaluate each aspect in terms of perceived knowledge, experience, satisfaction, diversity, oddness and interest. The analysis explores potential differences of students’ learning results between alternative and traditional teaching and also differences in the two aspects in relation to students’ preferences. Results provide evidence that active-learning methods can promote positive attitudinal shifts and improve skills in creativity, teamwork, collaboration and communication. Students perceived higher levels of learning than with traditional teaching. Finally in terms of students’ preferences, the majority wanted to have more courses taught with active-learning methods.     

Implicit theories,goal orientations,and perceived competence: Impact on students' achievement behavior

The present study was designed to explore relations between implicit theories of intelligence, goal orientations, perceived competence, and school achievement. It was assumed that implicit theories of intelligence orient individuals toward particular goals, which in turn influence achievement behavior. Perceived competence was hypothesized to moderate the relationship between implicit theories, goal orientations and actual achievement. Subjects were 451 elementary and junior high school students. The results of Pearson product moment correlations and Path analysis show theoretically important intercorrelations that replicated previous research. Implicit theories were not related to academic achievement. Goal orientations had an indirect effect on achievement, which was mediated through perceived competence. Educational implications of these findings are discussed. © 2002 Wiley Periodicals, Inc.     

An investigation of the usefulness of the Conner’s Continuous Performance Test II in the assessment of inattention and hyperactivity in the school

The Conners’ Continuous Performance Test (CCPT) is one of the most commonly used laboratory tests in the assessment of inattention and hyperactivity in children. Research suggests that the CCPT II has limited use in the identification of children’s inattention and hyperactivity in the school. Nonetheless, its usefulness to assess school-based inattention and hyperactivity has been examined by using only a small number of its performance measures. The purpose of the present study was to use the whole range of the performance measures included in the CCPT II to assess its potential to detect problems of attention and hyperactivity in the school setting. The CCPT II was administered to a selective sample (n?=?120) of 7-year-old primary school children with elevated rates of behaviour problems and reading difficulty. The Inattention and Hyperactivity subscales of the Conner’s Teacher Rating Scale – 28 (CTRS-28) were used to assess children’s problems of attention and hyperactivity in the school. Correlational analysis showed that the relationship between the CCPT II measures and children’s inattention and hyperactivity was relatively low (r range ?.02 to .38). Hierarchical regression analysis demonstrated that only three out of the 13 measures included in the CCPT II made a small contribution to the prediction of children’s inattention and hyperactivity scores. Of these measures, only one had not been previously used to examine the suitability of the CCPT II to assess inattention and hyperactivity in the school. The findings suggest that the use of the whole range of the CPPT II measures improves only slightly the tests capacity to identify inattention and hyperactivity in the school.     

Development of Lexical Mediation in the Relation Between Reading Comprehension and Word Reading Skills in Greek

This study focuses on the shared variance between reading comprehension and word-level reading skills in a population of 534 Greek children in Grades 2 through 4. The correlations between measures of word and pseudoword accuracy and fluency, on the one hand, and vocabulary and comprehension skills, on the other, were sizeable and stable or increasing with grade. However, the unique contribution of word reading to comprehension became negligible after vocabulary measures were entered in hierarchical regression analyses, particularly for higher grades, suggesting that any effects of decoding on comprehension may be mediated by the lexicon, consistent with lexical quality hypothesis. Structural modeling with latent variables revealed an invariant path across grades in which vocabulary was defined by its covariation with reading accuracy and fluency and affected comprehension directly. It is argued that skilled word reading influences comprehension by strengthening lexical representations, at least when phonological decoding can be relatively effortless.     

The effect of short-duration sprint interval exercise on plasma postprandial triacylglycerol levels in young men

Abstract

It is well established that regular exercise can reduce the risk of cardiovascular disease, although the most time-efficient exercise protocol to confer benefits has yet to be established. The aim of the current study was to determine the effects of short-duration sprint interval exercise on postprandial triacylglycerol. Fifteen healthy male participants completed two 2 day trials. On day 1, participants rested (control) or carried out twenty 6 s sprints, interspersed with 24 s recovery (sprint interval exercise – 14 min for total exercise session). On day 2, participants consumed a high-fat meal for breakfast with blood samples collected at baseline, 2 h and 4 h. Gas exchange was also measured at these time points. On day 2 of control and sprint interval exercise trials, there were no differences (P < 0.05) between trials in plasma glucose, triacylglycerol, insulin or respiratory exchange ratio (RER). The area under the curve for plasma triacylglycerol was 7.67 ± 2.37 mmol · l^–1.4 h^–1 in the control trial and 7.26 ± 2.49 mmol · l^–1.4 h^–1 in the sprint interval exercise trial. Although the sprint exercise protocol employed had no significant effect on postprandial triacylglycerol, there was a clear variability in responses that warrants further investigation.     

Distance learning technology and service support in Greece: The case study of the Aristotle University over the last decade

In this paper we present the distance-learning (DL) environment of the Aristotle University of Thessaloniki, Greece. The technical infrastructure is based on synchronous DL facilities. DL classrooms have been used successfully over the last decade. We present a generic data model for DL service provision. Supplementary services have also been developed in order to provide support for the DL service provision. The use cases of the DL service are described. The pedagogical issues regarding both students and teachers have been investigated using statistical surveys. The findings are presented in this paper. Finally, the conclusion and future work is discussed.     

Matthew effects in reading comprehension: myth or reality?

The presence of Matthew effects was tested in students of varying reading, spelling, and vocabulary skills. A cross-sequential design was implemented, following 587 Grade 2 through 4 students across five measurement points (waves) over 2 years. Students were administered standardized assessments of reading, spelling, and vocabulary. Results indicated that the hypothesized fan-spread pattern for Matthew effects was not evident. Low and high ability groups were formed based on 25th and 75th percentile cutoffs on initial measures of spelling, reading accuracy and fluency, vocabulary, and reading comprehension. Multilevel modeling suggested that low and high ability groups had significantly different starting points (intercepts) and their pattern of growth on passage comprehension did not indicate that the gap would increase over time. Instead, some analyses, especially of the youngest cohorts, showed significant convergence. However, there was no evidence of eventually closing the gap. Thus, although the poor students may not be getting poorer, they do not get sufficiently richer either.     

Motivational and affective determinants of self-regulatory strategy use in elementary school mathematics

The aim of the study was to investigate the relationships between elementary students’ reported use of self-regulatory strategies in mathematics and their motivational and affective determinants. Participants of the study were 344 fifth- and sixth-grade Greek students. Students were asked to complete self-reported measures regarding the strategies they use to self-regulate mathematics learning, their achievement goals in relation to mathematics, their self-efficacy concerning mathematics learning and achievement, the value they attribute to mathematics as a subject domain and their enjoyment of mathematics learning. Structural equation modelling confirmed a mediation model, that is, students’ mathematics self-efficacy, value beliefs about mathematics and enjoyment mediated the effects of achievement goals on reported strategy use. Results are discussed in terms of implications for elementary students’ self-regulated learning skills.     

Primary school students’ strategies in early algebra problem solving supported by an online game

In this study we investigated the role of a dynamic online game on students’ early algebra problem solving. In total 253 students from grades 4, 5, and 6 (10–12 years old) used the game at home to solve a sequence of early algebra problems consisting of contextual problems addressing covarying quantities. Special software monitored the students’ online working when solving the problems. Before and after the intervention a paper-and-pencil test on early algebra was administered. The data analysis revealed that the online working contributed to the students’ early algebra performance. There was a significant gain in performance across all grades. The highest effect was found in grade 6. Out of the three strategy profile clusters that could be distinguished in the whole sample, the cluster dominated by using extreme values and the cluster characterized by the trial-and-error strategy were most influential on the gain in early algebra performance. The students’ level of online working, which was defined as a combination of online involvement and strategy use, appeared to have a marginally significant effect on the gain score for the total sample. Per grade there was no significant effect, yet the levels of online working were significantly related to grade. Free playing was mostly performed in grade 4, looking for answers in grade 5, and exploring relations slightly more in grades 5 and 6. About 17 % of the effect of grade on the gain score was mediated by the level of online working.