Mindfulness Intervention for Maltreatment-Related Cognitive Decline

The goal of this clinical trial is to examine whether an online mindfulness-based training program can help improve cognitive function including attention, emotional regulation, and mental health (such as depression and anxiety) in young adults (ages 19 to 40) who have experienced maltreatment. The main questions it aims to answer are: * Can a 4-week online mindfulness program improve cognitive function including attention in adults with a history of maltreatment? * Does the program reduce symptoms of depression and anxiety compared to a control group? Researchers will compare a mindfulness training group with a waiting-list control group to see if the intervention leads to improvements in psychological and cognitive functioning. Participants will: * Complete psychological and cognitive assessments before and after the 4-week period * Watch weekly online educational and mindfulness practice videos (e.g., breathing, body scan, walking meditation) * Perform weekly mindfulness-based assignments through a study website * Engage in optional interaction via a chat channel