Breaking the spell: Changes in the behavior of two zoo-kept tigers (Panthera tigris) after exposure to a distinct feast-and-fast feeding regime.

The behavior of zoo carnivores has received intense attention due to their propensity for locomotor stereotypies. We observed two adult male tiger (Panthera tigris) siblings kept together for the duration of 104 days by round-the-clock video observation. The period consisted of three baseline periods with the zoo's regular feeding regime of five feeding days per week interrupted by two individual fasting days, with feeding occurring in the evening (B1-B3 of 14 days each). These periods were interrupted by two intervention periods (I1: randomized feeding times, 28 days; I2: gorge-feeding with three 10-day fasting periods, 34 days). As expected, day and night-time behavior was different, with the majority of sleep occurring at night. Pacing, which was mainly considered anticipatory, significantly decreased from 88 ± 132 min/day during B1 to 20 ± 33 min/day during B3. Pacing did not increase during the fasting days of I2. Over the course of whole study, lying time decreased and nonpacing locomotion increased. A major difference was observed between gorge-feeding and the subsequent first fasting days: during gorge-feeding, tigers spent a large part of the day feeding and locomoting (and less sleeping); on the subsequent day, they locomoted about 4.5 h less and slept about 4.3 h more. We suggest that interrupting routines by fasting periods of several days may be effective for reducing regular anticipatory behavior and creates an across-day structure that may correspond to the evolved psychological disposition of large carnivores.

[Technology-based interventions for alcohol prevention among children and adolescents]. / Technologiebasierte Interventionen zur Alkoholprävention bei Kindern und Jugendlichen.

BACKGROUND: Early onset and excessive alcohol use in childhood and adolescence is associated with an elevated risk of experiencing short-, mid-, and long-term negative consequences caused by, e.g., accidents, violent acts, and conflicts. Face-to-face prevention approaches show significant effects on the reduction of alcohol use. However, service utilization is often low among children and adolescents. Technology-based alcohol prevention has the potential to reach this target group with potentially cost-effective, standardized, and low-threshold measures. AIM AND METHOD: This narrative review provides an overview of different approaches of technology-based interventions for the prevention and early intervention of risky alcohol use among children and adolescents, their effectiveness, and settings for implementation. RESULTS: Technology-based alcohol prevention can be implemented in a variety of settings, e.g., school, community, primary care, or hospital. Implementation is often realized via websites with or without embedding face-to-face modules, apps, or SMS messages. While the cumulative evidence of the effectiveness of technology-based alcohol prevention is strong for adults and young adults, evidence for the effectiveness among children and adolescents is heterogeneous. DISCUSSION: Technology-based alcohol prevention has great theoretical potential with regards to reach, cost-effectiveness, and user engagement. Study replications are needed and evaluations of the effects of single elements, such as the individualization of content, user engagement through multiple contacts, and the use of multimedia elements and functions, should be addressed by future research.

An app-based training for adolescents with problematic digital-media use and their parents (Res@t digital): protocol for a cluster-randomized clinical trial.

Background: Digital media-use disorders (DMUD) in adolescents are a rising phenomenon associated with psychological distress, comorbid mental disorders, and high burden on affected families. Since the ICD-11 introduced criteria for gaming disorder, these can now be transferred to describe additional DMUD associated with social media platforms and streaming services. Most evidence for effective treatments comes from cognitive-behavioral therapy (CBT). However, interventions based on theoretical models for adolescents and their parents are widely missing, leading to a significant clinical gap. Methods: Res@t digital (Resource-Strengthening Training for Adolescents with Problematic Digital-Media Use and their Parents) is the app-based translation of the first model-based digital intervention for adolescents with DMUD and their parents based on CBT. It comprises separate but content-related modules for adolescents (Res@t-A) and parents (Res@t-P), applying multimodal techniques. The effectiveness of Res@t will be evaluated within a multicenter cluster-randomized controlled evaluator-blinded pre-post follow-up trial with the waitlist control group (CG). In addition to the Res@t program in the intervention group, both groups will receive treatment as usual within primary child and adolescent psychiatric/psychotherapeutic healthcare. The primary outcome addresses DMUD symptom reduction after 10 weeks. Secondary outcomes are related to a reduction in psychological and family-related problems and an increase in parental self-efficacy. All outcomes will be assessed using standardized self-report measures. A total of 1,334 participating adolescent-parent dyads from a large clinical network throughout Germany are planned to be included in the primary analyses based on an intention-to-treat approach, applying linear mixed models. Discussion: Assuming superiority of Res@t over the control condition, the intervention has the potential to provide evidence-based treatment for a significant number of help-seeking families, supporting local healthcare structures and resources. It is a promising program for practicable implementation and flexible use in different settings. Clinical trial registration: https://drks.de, DRKS00031043.