man scratching head, thinking with brain melting into many lines question marks

adhd adult amnesia background boy brain brainstorm brainy business chaos closeup cognitive concentration concept confused confusion contemplate critical daydreaming emotion employee expression facial feeling forget function glasses gray guy head human idea intelligence into isolated lines looking male man many marks melting memory mind mindfulness overload pensive people ponder portrait pressure problem problems psychology puzzled question recurring remember rethink scratching sign solution solve stress student task think thinking thought vision with wonder work worries young