Open Access

Electroencephalography (EEG) represents a widely established method for assessing altered and typically developing brain function. However, systematic studies on EEG data quality, its correlates, and consequences are scarce. To address this research gap, the current study focused on the percentage of artifact-free segments after standard EEG pre-processing as a data quality index. We analyzed participant-related and methodological influences, and validity by replicating landmark EEG effects. Further, effects of data quality on spectral power analyses beyond participant-related characteristics were explored. EEG data from a multicenter ADHD-cohort (age range 6 to 45 years), and a non-ADHD school-age control group were analyzed (ntotal = 305). Resting-state data during eyes open, and eyes closed conditions, and task-related data during a cued Continuous Performance Task (CPT) were collected. After pre-processing, general linear models, and stepwise regression models were fitted to the data. We found that EEG data quality was strongly related to demographic characteristics, but not to methodological factors. We were able to replicate maturational, task, and ADHD effects reported in the EEG literature, establishing a link with EEG-landmark effects. Furthermore, we showed that poor data quality significantly increases spectral power beyond effects of maturation and symptom severity. Taken together, the current results indicate that with a careful design and systematic quality control, informative large-scale multicenter trials characterizing neurophysiological mechanisms in neurodevelopmental disorders across the lifespan are feasible. Nevertheless, results are restricted to the limitations reported. Future work will clarify predictive value.

Two Romanian authors, Nora Iuga and Carmen Francesca Banciu have published their impressions about the German capital Berlin. Nora Iuga stayed there twice for a limited period of time (in 2000 and in 2010), whereas Carmen Francesca Banciu decided to live in Berlin after her scholarship there ended in 1991. This is why Carmen Francesca Banciu’s writing changed together with the changing city, which was then under construction not only literally but also in a figurative way integrating new influences due to the opening of Eastern Europe after the end of its isolation during the Cold War. She is one of those new elements which reshape Berlin adding new and different perspectives to its cultural life. Banciu publishes her impressions in Berlin ist mein Paris. Nora Iuga, on the other hand, remains nothing but a visitor. Her ideas about the City and about the Germans in general change a lot during her stays in Berlin. In the end, she leaves for Bucharest with new impressions, which are released in Romania in her book Berlinul meu e un monolog.

Zoos attract millions of visitors every year, many of whom are schoolchildren. For this reason, zoos are important institutions for the environmental education of future generations. Empirical studies on the educational impact of environmental education programs in zoos are still rare. To address this issue, we conducted two studies: In study 1, we investigated students’ interests in different biological topics, including zoos (n = 1,587). Data analysis of individual topics revealed large differences of interest, with advanced students showing less interest in zoos. In study 2, we invited school classes of this age group to visit different guided tours at the zoo and tested connection to nature before and after each educational intervention (n = 608). The results showed that the guided tours are an effective tool to raise students’ connection to nature. Add-on components have the potential to further promote connection to nature. The education programs are most effective with students with a low initial nature connection.