what human behaviours and or motivations are influenced by human experiences

Are you referring to the theme of friendship? The central theme of the movie is the theme of friendship, shown through Jess and Leslie. Jess comes from a poor family and is a target to school bullies, while Leslie is the new girl at school who everyone perceives as odd. They bond over being misunderstood and feeling neglected by their parents and let their imagination flow in the forest, imagining a land called Terabithia with mystical creatures and no limits on what is created there. The movie teaches the power of friendship by showing that both Leslie and Jess grow and become stronger together, standing up to their bullies and getting over their insecurities.