Purpose: Methylphenidate (MPH) derivative drugs are used because of psychostimulants effects on attention-deficit hyperactivity disorder in children and adults. As far as we know, toxic or anti-proliferative effects of MPH against cartilage tissue were not studied in the literature. The present study was carried out to investigate the possible effects of MPH on the proliferation, viability and differentiation of primary human chondrocytes, in vitro. Methods: Monolayer primary chondrocyte cultures were prepared using osteochondral tissue obtained from patients who underwent a total knee prosthesis operation. Stock solution of MPH was prepared and aliquots having 1–1000 µM concentrations of the drug was composed. These solutions were applied to the wells containing cultured chondrocyte samples within the well plates. Control groups were composed of pure chondrocyte culture and no solution was added into them. All groups were evaluated at 24, 48 and 72 h in order to determine the possible negative effects of the drug on the chondrocytes. The data were evaluated by Tukey’s honestly significantly different test following analysis of variance. Results: In the group where MPH was applied, it was found that viability, proliferation and stage-specific embryonic antigen-1 protein expression were decreased in comparison to the control group. Conclusions: It was emphasized that clinicians should not disregard the fact that this drug might suppress chondrocyte cell proliferation and chondrogenic differentiation.

The findings of our study suggest that children with ADHD have similar levels of trait and state empathy skills and facial expressions as healthy controls and CPs negatively affect their empathy skills. MPH treatment does not change trait empathy skills, yet there are some improvements in state empathy skills.

Objectives: Video games are especially popular among adolescents and young adults as a form of entertainment and the amount of time spent playing video games has increased rapidly. The main objective of this study is to assess the effect of video games on cognitive functions in adolescents. Methods: An exploratory, cross-sectional study was employed to investigate cognitive function in adolescent video game players. Cognitive functions, including memory, attention, and executive functions, were evaluated in 46 adolescents who had been playing video games regularly for at least 1 h per day, 5 days per week, for at least a year, and 31 adolescents (who played video games <5 h per week) using cognitive function assessment tests. Other data, such as demographics, medical information, video game types, and time spent playing video games were collected by questionnaires. Results: No significant difference was detected between the groups in terms of age, gender, IQ levels, and sociodemographic variables. Our findings show that visual memory results were slightly better in the playing group. Moreover, in the group that plays video games regularly, the increase in daily time spent playing games significantly increased the total error value in the Stroop Test and total interference value in California Verbal Learning Test-Children’s Version test. We also found that more time is spent on online games compared with traditional games. Conclusions: In this study, we emphasize the pathological and uncontrolled consumption of video games and the possible consequences of time spent playing games. Our findings indicate the need for more extensive research. Future research should address the various implications of video game play, especially between the potentially positive and negative effects of video games.

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