Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe
ISSN (online) 1866-8364
URN urn:nbn:de:kobv:517-series-394
Herausgegeben von der Universität Potsdam
URN urn:nbn:de:kobv:517-series-394
Herausgegeben von der Universität Potsdam
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583
Evidence-based prescriptions for balance training in youth have recently been established. However, there is currently no standardized means available to assess and quantify balance task difficulty (BTD). Therefore, the objectives of this study were to examine the effects of graded BTD on postural sway, lower limb muscle activity and coactivation in adolescents. Thirteen healthy high-school students aged 16 to 17 volunteered to participate in this cross-sectional study. Testing involved participants to stand on a commercially available balance board with an adjustable pivot that allowed six levels of increasing task difficulty. Postural sway [i.e., total center of pressure (CoP) displacements] and lower limb muscle activity were recorded simultaneously during each trial. Surface electromyography (EMG) was applied in muscles encompassing the ankle (m. tibialis anterior, medial gastrocnemius, peroneus longus) and knee joint (m. vastus medialis, biceps femoris). The coactivation index (CAI) was calculated for ankle and thigh muscles. Repeated measures analyses of variance revealed a significant main effect of BTD with increasing task difficulty for postural sway (p < 0.001; d = 6.36), muscle activity (p < 0.001; 2.19 < d < 4.88), and CAI (p < 0.001; 1.32 < d < 1.41). Multiple regression analyses showed that m. tibialis anterior activity best explained overall CoP displacements with 32.5% explained variance (p < 0.001). The observed increases in postural sway, lower limb muscle activity, and coactivation indicate increasing postural demands while standing on the balance board. Thus, the examined board can be implemented in balance training to progressively increase BTD in healthy adolescents.
paper 267
Der Tagungsband stellt das Werk Hans Tietgens' in den Mittelpunkt. Die Beiträge des Bandes dokumentieren weniger ein Tagungsgeschehen als vielmehr zeitgenössische Interpretationen und Anschlüsse an theoretischen Reflexionen Hans Tietgens', die auch heute noch eine große Relevanz besitzen. Auf diese Weise eröffnen die vorliegenden Beiträge einen aktuellen Zugang zu den Arbeiten des Erwachsenenbildners.
paper 265
Die Untersuchung "Gymnasio und Lykio in Griechenland. Ergebnisse einer Längsschnittuntersuchung, Kritik und Perspektiven" wurde von Panajotis Xochellis, Universität Thessaloniki, und Diether Hopf, Max-Planck-Institut für Bildungsforschung, 1980 begonnen und nach drei Messzeitpunkten mit einer letzten Datenerhebung im Schuljahr 2000/2001 abgeschlossen. Es geht um die Entwicklung ausgewählter Schulen in einem 20-jährigen Zeitraum, wobei Daten aus einer Vielzahl von Perspektiven erhoben wurden: Neben Informationen aus der allgemeinen griechischen Bildungsstatistik wurden die Schulleiter der Schulen befragt und interviewt, Lehrer füllten Fragebögen aus und ließen ihren Unterricht beobachten, außerdem wurden Schüler ausführlich befragt. Inhaltlich stehen die folgenden Themen im Vordergrund: Didaktik und Methodik in 5 Fächern (Neugriechisch, Altgriechisch, Geschichte, Mathematik, Physik), Leistungsbeurteilung und Übergangsauslese zum tertiären Sektor, Schul- und Unterrichtsklima, Motivation und Interessen der Schüler. Außerdem werden strukturelle Daten über das griechische Sekundarschulwesen insgesamt mit Bezug auf die untersuchten Schulen interpretiert und in den Zusammenhang mit internationalen Leistungsstudien (z.B. PISA) gestellt. Variablen wie Geschlecht der Schüler und Lehrer oder sozioökonomischer Status finden ebenfalls Berücksichtigung. Insgesamt ergibt sich eine Fülle interessanter Resultate, die teilweise von erheblicher bildungspolitischer Relevanz sind.
paper 264
We present an approach to generate (multivariate) twin surrogates (TS) based on recurrence properties. This technique generates surrogates which correspond to an independent copy of the underlying system, i. e. they induce a trajectory of the underlying system starting at different initial conditions. We show that these surrogates are well suited to test for complex synchronisation and exemplify this for the paradigmatic system of R¨ossler oscillators. The proposed test enables to assess the statistical relevance of a synchronisation analysis from passive experiments which are typical in natural systems.
paper 263
Reading requires the orchestration of visual, attentional, language-related, and oculomotor processing constraints. This study replicates previous effects of frequency, predictability, and length of fixated words on fixation durations in natural reading and demonstrates new effects of these variables related to previous and next words. Results are based on fixation durations recorded from 222 persons, each reading 144 sentences. Such evidence for distributed processing of words across fixation durations challenges psycholinguistic immediacy-of-processing and eye-mind assumptions. Most of the time the mind processes several words in parallel at different perceptual and cognitive levels. Eye movements can help to unravel these processes.
paper 262
We examined relations between eye movements (single-fixation durations) and RSVP-based event-related potentials (ERPs; N400’s) recorded during reading the same sentences in two independent experiments. Longer fixation durations correlated with larger N400 amplitudes. Word frequency and predictability of the fixated word as well as the predictability of the upcoming word accounted for this covariance in a path-analytic model. Moreover, larger N400 amplitudes entailed longer fixation durations on the next word, a relation accounted for by word frequency. This pattern offers a neurophysiological correlate for the lag-word frequency effect on fixation durations: Word processing is reliably expressed not only in fixation durations on currently fixated words, but also in those on subsequently fixated words.
paper 261
Eye movements in reading are sensitive to foveal and parafoveal word features. Whereas the influence of orthographic or phonological parafoveal information on gaze control is undisputed, there has been no reliable evidence for early parafoveal extraction of semantic information in alphabetic script. Using a novel combination of the gaze-contingent fast-priming and boundary paradigms, we demonstrate semantic preview benefit when a semantically related parafoveal word was available during the initial 125 ms of a fixation on the pre-target word (Experiments 1 and 2). When the target location was made more salient, significant parafoveal semantic priming occurred only at 80 ms (Experiment 3). Finally, with short primes only (20, 40, 60 ms) effects were not significant but numerically in the expected direction for 40 and 60 ms (Experiment 4). In all experiments, fixation durations on the target word increased with prime durations under all conditions. The evidence for extraction of semantic information from the parafoveal word favors an explanation in terms of parallel word processing in reading.
paper 257
Using the gaze-contingent boundary paradigm with the boundary placed after word n, we manipulated preview of word n+2 for fixations on word n. There was no preview benefit for first-pass reading on word n+2, replicating the results of Rayner, Juhasz, and Brown (2007), but there was a preview benefit on the three-letter word n+1, that is, after the boundary, but before word n+2. Additionally, both word n+1 and word n+2 exhibited parafoveal-on-foveal effects on word n. Thus, during a fixation on word n and given a short word n+1, some information is extracted from word n+2, supporting the hypothesis of distributed processing in the perceptual span.
paper 256
It has recently been demonstrated that the presentation of a rare target in a visual oddball paradigm induces a prolonged inhibition of microsaccades. In the field of electrophysiology, the amplitude of the P300 component in event-related potentials (ERP) has been shown to be sensitive to the stimulus category (target vs. non target) of the eliciting stimulus, its overall probability, and the preceding stimulus sequence. In the present study we further specify the functional underpinnings of the prolonged microsaccadic inhibition in the visual oddball task, showing that the stimulus category, the frequency of a stimulus and the preceding stimulus sequence influence microsaccade rate. Furthermore, by co-recording ERPs and eye-movements, we were able to demonstrate that, despite being largely sensitive to the same experimental manipulation, the amplitude of P300 and the microsaccadic inhibition predict each other very weakly, and thus constitute two independent measures of the brain’s response to rare targets in the visual oddball paradigm.