Brain-training uses HEG or EEG devices to monitor brain activity and aims to gain voluntary control over behaviors, habits, and patterns. It can help treat disorders like ADHD, anxiety, and depression. The training involves seeing feedback on one's brain activation, working to control targeted areas, and establishing long-term changes through awareness, movement, and practice. Notable effects can occur within two weeks when doing one to three sessions per week, lasting 15-45 minutes each.