Research Appraisals
Evidence-based critical appraisals of the latest medical research, systematically evaluated using Oxford CEBM methodology.
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Scientific reports
Adaptive level modification via player skill classification and large language models
Maintaining player engagement in video games requires a careful balance between challenge and player competence. Static difficulty settings fail to account for individual skill variation, while existing dynamic difficulty adjustment systems are limited to tuning low-level game parameters rather than restructuring level content. This paper presents an adaptive level modification framework that personalizes gameplay by continuously inferring player skill and applying targeted structural modifications to level content in real-time. A hybrid behavioral dataset is constructed by combining agent-generated trajectories, produced by Proximal Policy Optimization (PPO) agents, a reinforcement learning approach, trained at three distinct skill levels, with manually collected human gameplay data labeled through clustering. A classifier trained on this dataset categorizes players into expert, normal, and beginner skill levels, achieving an overall accuracy of 97.82%. The classifier output drives a two-stage large language model (LLM) pipeline guided by prompt engineering, which expands a skill-conditioned prompt into a structured modification instruction applied to the current level chunk. A physics-constrained verifier based on a graph-based shortest path method ensures all modified levels remain traversable. Evaluated on Super Mario Bros. levels, the framework achieves a post-modification playability rate of 74.1% at the full-level granularity and 83.5% at the isolated-chunk granularity, closely matching the 80.0% baseline of the original levels.
30 July 2026
Read appraisal →European journal of pediatrics
Subtypes in developmental coordination disorder: what do we know so far? A systematic review.
UNLABELLED: Developmental coordination disorder (DCD) is a highly heterogeneous disorder. This systematic review examined whether statistically derived clusters can effectively distinguish subgroups of children with DCD. Web of Science, Scopus, PubMed, Embase, and PsycInfo were systematically searched (CRD420251237685) using controlled terminology and free-text terms. Studies were eligible if they included children (aged 0-18 years) with DCD with(out) comorbidities and employed statistical clustering to identify subtypes. Methodological quality was assessed using an adapted version of the Critical Appraisal Skills Programme and certainty of the evidence with the Grading of Recommendations Assessment, Development and Evaluation. Ten of the 1719 search results were included, three of which included both children with DCD and typical development. Two studies explored clusters unidimensionally (motor-only and mental health-only). Eight studies included multiple domains of functioning: motor (n = 8), sensory functions (n = 5), fitness (n = 3), cognitive functions (n = 3), executive functions (n = 2), mental health (n = 1), and participation (n = 1). Studies identified between four (n = 4) and six (n = 1) subtypes, which primarily reflected gradients of severity rather than distinct domain-specific profiles. The overall certainty of evidence for distinct subtypes in DCD was rated low to very low. CONCLUSION: Evidence suggests that DCD is better conceptualized as a spectrum of pervasiveness rather than discrete subtypes. Existing findings lack consistency across studies due to methodological shortcomings and variable measurement domains. Although evidence-based clinical subtypes cannot yet be recommended, future research should prioritize subtyping studies focused on primary symptoms to better identify potential phenotypes within the DCD population. WHAT IS KNOWN: • DCD is a heterogeneous condition, and identifying discrete subtypes is a long-standing research goal to improve clinical support. • Researchers have proposed various motor and non-motor profiles, but no consensus exists on a definitive subtyping model. WHAT IS NEW: • This review found no consistent discrete subtypes, suggesting DCD is better viewed as a spectrum of pervasiveness rather than categories. • Future research should focus on subtyping primary motor symptoms to determine whether distinct, stable subgroups exist within the broader DCD population.
22 June 2026
Read appraisal →Medical science monitor : international medical journal of experimental and clinical research
Impact of Gross Motor Coordination Exercises on Perceptual Processes and Praxis in Early School Children With Symptoms of Developmental Coordination Disorder: Preliminary Report of Randomized Controlled Study
BACKGROUND Physical activity has a general impact on cognitive processes, but evidence on the effects of specific exercises on particular cognitive or executive functions remains limited. Previous studies suggest that movements crossing the body's midline stimulate excitability and plasticity in the dorsolateral prefrontal cortex and superior parietal cortex. This study aimed to investigate whether such exercises produce long-term functional changes in these areas. MATERIAL AND METHODS The study involved 22 children aged 6 to 8 years with symptoms of developmental coordination disorder (DCD), divided into 2 equal groups. Both groups completed approximately 9 weeks of coordination training based on Bilateral Integration by Sheila Dobie OBE (the total diagnostic and therapeutic cycle lasted approximately 16 weeks, including a break). The intervention group performed exercises involving midline crossing, while the control group performed exercises without this element. Assessments (sensory integration and praxis tests and the bilateral motor coordination test) were conducted 3 times: before intervention, after 9-week program, and at follow-up. RESULTS Significant improvements were observed in both groups in sequencing praxis (P=0.041 in the control group; P<0.001 in the intervention group) and bilateral motor coordination (P=0.013; P=0.020), but at different rates. In the intervention group, improvements appeared after the intervention, while in the control group only at follow-up. Large effect sizes were found (η² ϵ [0.293, 0.670]), with high statistical power. No significant changes were observed in other functions. CONCLUSIONS The Bilateral Integration method improves sequencing praxis and interhemispheric integration in children with DCD symptoms. Midline-crossing exercises may yield relatively fast improvements in short-term programs.
11 June 2026
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