The Prevalence of Subclinical ADHD and Its Associations with Negative Affect Among Medical Students—A Cross-Sectional Study and an Exploratory Neurofeedback Pilot Study

Background: Attention-Deficit/Hyperactivity Disorder (ADHD) has been less frequently and extensively investigated in university students than in children, despite substantial evidence demonstrating its significant impact on academic performance and negative affect, such as anxiety. We conducted two studies to address this gap. Methods: The objective of our first study (n = 233) was to assess the prevalence of subclinical ADHD among medical students and examine its associations with comorbid mental health conditions, such as Depression, Anxiety and Stress (DASS-21). In the second pilot intervention study (n = 16), we compared the ratio of negative and positive emotions (PANAS) and anxiety (STAI-S-5) before and after neurofeedback-based relaxation training in two groups of students: one with high scores and another with low scores on the Adult ADHD Self-Report Scale (ASRS). Results: According to our results, more than 50% of students showed risk for ADHD symptoms, and linear regression analyses revealed a strong association between ADHD symptoms and the prevalence of negative affect. Interestingly, no significant differences were found in ADHD and DASS scale scores between students who were falling behind and those progressing in line with the curriculum. Further results of the second study were inconclusive in several areas. In the examined group, a significant increase was observed in one of the core symptoms of ADHD—mind wandering—by the end of the intervention, compared to the baseline. Additionally, frustration levels were significantly higher at the second measurement point among participants with higher ASRS scores. Conclusions: Compared to the literature, it can be concluded that while longer interventions tend to be effective, two sessions are insufficient to reduce symptom.