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Adipositas
(2008)
In this paper, we present an approach to recover the dynamics from recurrences of a system and then generate (multivariate) twin surrogate (TS) trajectories. In contrast to other approaches, such as the linear-like surrogates, this technique produces surrogates which correspond to an independent copy of the underlying system, i.e. they induce a trajectory of the underlying system visiting the attractor in a different way. We show that these surrogates are well suited to test for complex synchronization, which makes it possible to systematically assess the reliability of synchronization analyses. We then apply the TS to study binocular fixational movements and find strong indications that the fixational movements of the left and right eye are phase synchronized. This result indicates that there might be only one centre in the brain that produces the fixational movements in both eyes or a close link between the two centres.
Neuronale Verarbeitung emotionaler Prosodie und Syntax : die Rolle des verbalen Arbeitsgedächnisses
(2008)
Use and misuse, age of first substance use, and prevalence of problematic use of legal (alcohol, nicotine) and illegal (cannabis etc.) drugs in adolescence were analyzed. The risk and protective factors for substance misuse were investigated. A representative sample of 246 14-15 year-olds were examined (20% of the population of a defined German region, cross-sectional design, self-rating inventory). Prevalence rates for problematic use were 19.9% for alcohol, 48% for nicotine, and 16.7% for illegal drugs. Mean age of first substance use was age 12 for legal drugs and age 14 for illegal drugs. 4,9% of the adolescents showed concurrent problematic use of nicotine, alcohol, and illegal drugs (male- female ratio: 5,2:1). Problematic substance use could be predicted best by a combination of risk factors (school failure, low level for availability of illegal drugs in the neighbourhood) and protective factors (participating a lot of sport, positive family climate). Suggestions for universal, selective, and indicated preventive interventions were derived.